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// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (C) 2004-2016, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** * file name: uregex.h * encoding: UTF-8 * indentation:4 * * created on: 2004mar09 * created by: Andy Heninger * * ICU Regular Expressions, API for C */ /** * \file * \brief C API: Regular Expressions * * This is a C wrapper around the C++ RegexPattern and RegexMatcher classes. */ #ifndef UREGEX_H #define UREGEX_H #include "unicode/utext.h" #include "unicode/utypes.h" #if !UCONFIG_NO_REGULAR_EXPRESSIONS #include "unicode/parseerr.h" #if U_SHOW_CPLUSPLUS_API #include "unicode/localpointer.h" #endif // U_SHOW_CPLUSPLUS_API struct URegularExpression; /** * Structure representing a compiled regular expression, plus the results * of a match operation. * @stable ICU 3.0 */ typedef struct URegularExpression URegularExpression; /** * Constants for Regular Expression Match Modes. * @stable ICU 2.4 */ typedef enum URegexpFlag{ #ifndef U_HIDE_DRAFT_API /** Forces normalization of pattern and strings. Not implemented yet, just a placeholder, hence draft. @draft ICU 2.4 */ UREGEX_CANON_EQ = 128, #endif /* U_HIDE_DRAFT_API */ /** Enable case insensitive matching. @stable ICU 2.4 */ UREGEX_CASE_INSENSITIVE = 2, /** Allow white space and comments within patterns @stable ICU 2.4 */ UREGEX_COMMENTS = 4, /** If set, '.' matches line terminators, otherwise '.' matching stops at line end. * @stable ICU 2.4 */ UREGEX_DOTALL = 32, /** If set, treat the entire pattern as a literal string. * Metacharacters or escape sequences in the input sequence will be given * no special meaning. * * The flag UREGEX_CASE_INSENSITIVE retains its impact * on matching when used in conjunction with this flag. * The other flags become superfluous. * * @stable ICU 4.0 */ UREGEX_LITERAL = 16, /** Control behavior of "$" and "^" * If set, recognize line terminators within string, * otherwise, match only at start and end of input string. * @stable ICU 2.4 */ UREGEX_MULTILINE = 8, /** Unix-only line endings. * When this mode is enabled, only \\u000a is recognized as a line ending * in the behavior of ., ^, and $. * @stable ICU 4.0 */ UREGEX_UNIX_LINES = 1, /** Unicode word boundaries. * If set, \b uses the Unicode TR 29 definition of word boundaries. * Warning: Unicode word boundaries are quite different from * traditional regular expression word boundaries. See * http://unicode.org/reports/tr29/#Word_Boundaries * @stable ICU 2.8 */ UREGEX_UWORD = 256, /** Error on Unrecognized backslash escapes. * If set, fail with an error on patterns that contain * backslash-escaped ASCII letters without a known special * meaning. If this flag is not set, these * escaped letters represent themselves. * @stable ICU 4.0 */ UREGEX_ERROR_ON_UNKNOWN_ESCAPES = 512 } URegexpFlag; /** * Open (compile) an ICU regular expression. Compiles the regular expression in * string form into an internal representation using the specified match mode flags. * The resulting regular expression handle can then be used to perform various * matching operations. * * * @param pattern The Regular Expression pattern to be compiled. * @param patternLength The length of the pattern, or -1 if the pattern is * NUL terminated. * @param flags Flags that alter the default matching behavior for * the regular expression, UREGEX_CASE_INSENSITIVE, for * example. For default behavior, set this parameter to zero. * See <code>enum URegexpFlag</code>. All desired flags * are bitwise-ORed together. * @param pe Receives the position (line and column numbers) of any syntax * error within the source regular expression string. If this * information is not wanted, pass NULL for this parameter. * @param status Receives error detected by this function. * @stable ICU 3.0 * */ U_CAPI URegularExpression * U_EXPORT2 uregex_open( const UChar *pattern, int32_t patternLength, uint32_t flags, UParseError *pe, UErrorCode *status); /** * Open (compile) an ICU regular expression. Compiles the regular expression in * string form into an internal representation using the specified match mode flags. * The resulting regular expression handle can then be used to perform various * matching operations. * * The contents of the pattern UText will be extracted and saved. Ownership of the * UText struct itself remains with the caller. This is to match the behavior of * uregex_open(). * * @param pattern The Regular Expression pattern to be compiled. * @param flags Flags that alter the default matching behavior for * the regular expression, UREGEX_CASE_INSENSITIVE, for * example. For default behavior, set this parameter to zero. * See <code>enum URegexpFlag</code>. All desired flags * are bitwise-ORed together. * @param pe Receives the position (line and column numbers) of any syntax * error within the source regular expression string. If this * information is not wanted, pass NULL for this parameter. * @param status Receives error detected by this function. * * @stable ICU 4.6 */ U_CAPI URegularExpression * U_EXPORT2 uregex_openUText(UText *pattern, uint32_t flags, UParseError *pe, UErrorCode *status); #if !UCONFIG_NO_CONVERSION /** * Open (compile) an ICU regular expression. The resulting regular expression * handle can then be used to perform various matching operations. * * This function is the same as uregex_open, except that the pattern * is supplied as an 8 bit char * string in the default code page. * * @param pattern The Regular Expression pattern to be compiled, * NUL terminated. * @param flags Flags that alter the default matching behavior for * the regular expression, UREGEX_CASE_INSENSITIVE, for * example. For default behavior, set this parameter to zero. * See <code>enum URegexpFlag</code>. All desired flags * are bitwise-ORed together. * @param pe Receives the position (line and column numbers) of any syntax * error within the source regular expression string. If this * information is not wanted, pass NULL for this parameter. * @param status Receives errors detected by this function. * @return The URegularExpression object representing the compiled * pattern. * * @stable ICU 3.0 */ U_CAPI URegularExpression * U_EXPORT2 uregex_openC( const char *pattern, uint32_t flags, UParseError *pe, UErrorCode *status); #endif /** * Close the regular expression, recovering all resources (memory) it * was holding. * * @param regexp The regular expression to be closed. * @stable ICU 3.0 */ U_CAPI void U_EXPORT2 uregex_close(URegularExpression *regexp); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalURegularExpressionPointer * "Smart pointer" class, closes a URegularExpression via uregex_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 4.4 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalURegularExpressionPointer, URegularExpression, uregex_close); U_NAMESPACE_END #endif /** * Make a copy of a compiled regular expression. Cloning a regular * expression is faster than opening a second instance from the source * form of the expression, and requires less memory. * * Note that the current input string and the position of any matched text * within it are not cloned; only the pattern itself and the * match mode flags are copied. * * Cloning can be particularly useful to threaded applications that perform * multiple match operations in parallel. Each concurrent RE * operation requires its own instance of a URegularExpression. * * @param regexp The compiled regular expression to be cloned. * @param status Receives indication of any errors encountered * @return the cloned copy of the compiled regular expression. * @stable ICU 3.0 */ U_CAPI URegularExpression * U_EXPORT2 uregex_clone(const URegularExpression *regexp, UErrorCode *status); /** * Returns a pointer to the source form of the pattern for this regular expression. * This function will work even if the pattern was originally specified as a UText. * * @param regexp The compiled regular expression. * @param patLength This output parameter will be set to the length of the * pattern string. A NULL pointer may be used here if the * pattern length is not needed, as would be the case if * the pattern is known in advance to be a NUL terminated * string. * @param status Receives errors detected by this function. * @return a pointer to the pattern string. The storage for the string is * owned by the regular expression object, and must not be * altered or deleted by the application. The returned string * will remain valid until the regular expression is closed. * @stable ICU 3.0 */ U_CAPI const UChar * U_EXPORT2 uregex_pattern(const URegularExpression *regexp, int32_t *patLength, UErrorCode *status); /** * Returns the source text of the pattern for this regular expression. * This function will work even if the pattern was originally specified as a UChar string. * * @param regexp The compiled regular expression. * @param status Receives errors detected by this function. * @return the pattern text. The storage for the text is owned by the regular expression * object, and must not be altered or deleted. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_patternUText(const URegularExpression *regexp, UErrorCode *status); /** * Get the match mode flags that were specified when compiling this regular expression. * @param status Receives errors detected by this function. * @param regexp The compiled regular expression. * @return The match mode flags * @see URegexpFlag * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_flags(const URegularExpression *regexp, UErrorCode *status); /** * Set the subject text string upon which the regular expression will look for matches. * This function may be called any number of times, allowing the regular * expression pattern to be applied to different strings. * * Regular expression matching operations work directly on the application's * string data. No copy is made. The subject string data must not be * altered after calling this function until after all regular expression * operations involving this string data are completed. * * Zero length strings are permitted. In this case, no subsequent match * operation will dereference the text string pointer. * * @param regexp The compiled regular expression. * @param text The subject text string. * @param textLength The length of the subject text, or -1 if the string * is NUL terminated. * @param status Receives errors detected by this function. * @stable ICU 3.0 */ U_CAPI void U_EXPORT2 uregex_setText(URegularExpression *regexp, const UChar *text, int32_t textLength, UErrorCode *status); /** * Set the subject text string upon which the regular expression will look for matches. * This function may be called any number of times, allowing the regular * expression pattern to be applied to different strings. * * Regular expression matching operations work directly on the application's * string data; only a shallow clone is made. The subject string data must not be * altered after calling this function until after all regular expression * operations involving this string data are completed. * * @param regexp The compiled regular expression. * @param text The subject text string. * @param status Receives errors detected by this function. * * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_setUText(URegularExpression *regexp, UText *text, UErrorCode *status); /** * Get the subject text that is currently associated with this * regular expression object. If the input was supplied using uregex_setText(), * that pointer will be returned. Otherwise, the characters in the input will * be extracted to a buffer and returned. In either case, ownership remains * with the regular expression object. * * This function will work even if the input was originally specified as a UText. * * @param regexp The compiled regular expression. * @param textLength The length of the string is returned in this output parameter. * A NULL pointer may be used here if the * text length is not needed, as would be the case if * the text is known in advance to be a NUL terminated * string. * @param status Receives errors detected by this function. * @return Pointer to the subject text string currently associated with * this regular expression. * @stable ICU 3.0 */ U_CAPI const UChar * U_EXPORT2 uregex_getText(URegularExpression *regexp, int32_t *textLength, UErrorCode *status); /** * Get the subject text that is currently associated with this * regular expression object. * * This function will work even if the input was originally specified as a UChar string. * * @param regexp The compiled regular expression. * @param dest A mutable UText in which to store the current input. * If NULL, a new UText will be created as an immutable shallow clone * of the actual input string. * @param status Receives errors detected by this function. * @return The subject text currently associated with this regular expression. * If a pre-allocated UText was provided, it will always be used and returned. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_getUText(URegularExpression *regexp, UText *dest, UErrorCode *status); /** * Set the subject text string upon which the regular expression is looking for matches * without changing any other aspect of the matching state. * The new and previous text strings must have the same content. * * This function is intended for use in environments where ICU is operating on * strings that may move around in memory. It provides a mechanism for notifying * ICU that the string has been relocated, and providing a new UText to access the * string in its new position. * * Note that the regular expression implementation never copies the underlying text * of a string being matched, but always operates directly on the original text * provided by the user. Refreshing simply drops the references to the old text * and replaces them with references to the new. * * Caution: this function is normally used only by very specialized * system-level code. One example use case is with garbage collection * that moves the text in memory. * * @param regexp The compiled regular expression. * @param text The new (moved) text string. * @param status Receives errors detected by this function. * * @stable ICU 4.8 */ U_CAPI void U_EXPORT2 uregex_refreshUText(URegularExpression *regexp, UText *text, UErrorCode *status); /** * Attempts to match the input string against the pattern. * To succeed, the match must extend to the end of the string, * or cover the complete match region. * * If startIndex >= zero the match operation starts at the specified * index and must extend to the end of the input string. Any region * that has been specified is reset. * * If startIndex == -1 the match must cover the input region, or the entire * input string if no region has been set. This directly corresponds to * Matcher.matches() in Java * * @param regexp The compiled regular expression. * @param startIndex The input string (native) index at which to begin matching, or -1 * to match the input Region. * @param status Receives errors detected by this function. * @return true if there is a match * @stable ICU 3.0 */ U_CAPI UBool U_EXPORT2 uregex_matches(URegularExpression *regexp, int32_t startIndex, UErrorCode *status); /** * 64bit version of uregex_matches. * Attempts to match the input string against the pattern. * To succeed, the match must extend to the end of the string, * or cover the complete match region. * * If startIndex >= zero the match operation starts at the specified * index and must extend to the end of the input string. Any region * that has been specified is reset. * * If startIndex == -1 the match must cover the input region, or the entire * input string if no region has been set. This directly corresponds to * Matcher.matches() in Java * * @param regexp The compiled regular expression. * @param startIndex The input string (native) index at which to begin matching, or -1 * to match the input Region. * @param status Receives errors detected by this function. * @return true if there is a match * @stable ICU 4.6 */ U_CAPI UBool U_EXPORT2 uregex_matches64(URegularExpression *regexp, int64_t startIndex, UErrorCode *status); /** * Attempts to match the input string, starting from the specified index, against the pattern. * The match may be of any length, and is not required to extend to the end * of the input string. Contrast with uregex_matches(). * * If startIndex is >= 0 any input region that was set for this * URegularExpression is reset before the operation begins. * * If the specified starting index == -1 the match begins at the start of the input * region, or at the start of the full string if no region has been specified. * This corresponds directly with Matcher.lookingAt() in Java. * * If the match succeeds then more information can be obtained via the * <code>uregexp_start()</code>, <code>uregexp_end()</code>, * and <code>uregex_group()</code> functions. * * @param regexp The compiled regular expression. * @param startIndex The input string (native) index at which to begin matching, or * -1 to match the Input Region * @param status A reference to a UErrorCode to receive any errors. * @return true if there is a match. * @stable ICU 3.0 */ U_CAPI UBool U_EXPORT2 uregex_lookingAt(URegularExpression *regexp, int32_t startIndex, UErrorCode *status); /** * 64bit version of uregex_lookingAt. * Attempts to match the input string, starting from the specified index, against the pattern. * The match may be of any length, and is not required to extend to the end * of the input string. Contrast with uregex_matches(). * * If startIndex is >= 0 any input region that was set for this * URegularExpression is reset before the operation begins. * * If the specified starting index == -1 the match begins at the start of the input * region, or at the start of the full string if no region has been specified. * This corresponds directly with Matcher.lookingAt() in Java. * * If the match succeeds then more information can be obtained via the * <code>uregexp_start()</code>, <code>uregexp_end()</code>, * and <code>uregex_group()</code> functions. * * @param regexp The compiled regular expression. * @param startIndex The input string (native) index at which to begin matching, or * -1 to match the Input Region * @param status A reference to a UErrorCode to receive any errors. * @return true if there is a match. * @stable ICU 4.6 */ U_CAPI UBool U_EXPORT2 uregex_lookingAt64(URegularExpression *regexp, int64_t startIndex, UErrorCode *status); /** * Find the first matching substring of the input string that matches the pattern. * If startIndex is >= zero the search for a match begins at the specified index, * and any match region is reset. This corresponds directly with * Matcher.find(startIndex) in Java. * * If startIndex == -1 the search begins at the start of the input region, * or at the start of the full string if no region has been specified. * * If a match is found, <code>uregex_start(), uregex_end()</code>, and * <code>uregex_group()</code> will provide more information regarding the match. * * @param regexp The compiled regular expression. * @param startIndex The position (native) in the input string to begin the search, or * -1 to search within the Input Region. * @param status A reference to a UErrorCode to receive any errors. * @return true if a match is found. * @stable ICU 3.0 */ U_CAPI UBool U_EXPORT2 uregex_find(URegularExpression *regexp, int32_t startIndex, UErrorCode *status); /** * 64bit version of uregex_find. * Find the first matching substring of the input string that matches the pattern. * If startIndex is >= zero the search for a match begins at the specified index, * and any match region is reset. This corresponds directly with * Matcher.find(startIndex) in Java. * * If startIndex == -1 the search begins at the start of the input region, * or at the start of the full string if no region has been specified. * * If a match is found, <code>uregex_start(), uregex_end()</code>, and * <code>uregex_group()</code> will provide more information regarding the match. * * @param regexp The compiled regular expression. * @param startIndex The position (native) in the input string to begin the search, or * -1 to search within the Input Region. * @param status A reference to a UErrorCode to receive any errors. * @return true if a match is found. * @stable ICU 4.6 */ U_CAPI UBool U_EXPORT2 uregex_find64(URegularExpression *regexp, int64_t startIndex, UErrorCode *status); /** * Find the next pattern match in the input string. Begin searching * the input at the location following the end of he previous match, * or at the start of the string (or region) if there is no * previous match. If a match is found, <code>uregex_start(), uregex_end()</code>, and * <code>uregex_group()</code> will provide more information regarding the match. * * @param regexp The compiled regular expression. * @param status A reference to a UErrorCode to receive any errors. * @return true if a match is found. * @see uregex_reset * @stable ICU 3.0 */ U_CAPI UBool U_EXPORT2 uregex_findNext(URegularExpression *regexp, UErrorCode *status); /** * Get the number of capturing groups in this regular expression's pattern. * @param regexp The compiled regular expression. * @param status A reference to a UErrorCode to receive any errors. * @return the number of capture groups * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_groupCount(URegularExpression *regexp, UErrorCode *status); /** * Get the group number corresponding to a named capture group. * The returned number can be used with any function that access * capture groups by number. * * The function returns an error status if the specified name does not * appear in the pattern. * * @param regexp The compiled regular expression. * @param groupName The capture group name. * @param nameLength The length of the name, or -1 if the name is a * nul-terminated string. * @param status A pointer to a UErrorCode to receive any errors. * * @stable ICU 55 */ U_CAPI int32_t U_EXPORT2 uregex_groupNumberFromName(URegularExpression *regexp, const UChar *groupName, int32_t nameLength, UErrorCode *status); /** * Get the group number corresponding to a named capture group. * The returned number can be used with any function that access * capture groups by number. * * The function returns an error status if the specified name does not * appear in the pattern. * * @param regexp The compiled regular expression. * @param groupName The capture group name, * platform invariant characters only. * @param nameLength The length of the name, or -1 if the name is * nul-terminated. * @param status A pointer to a UErrorCode to receive any errors. * * @stable ICU 55 */ U_CAPI int32_t U_EXPORT2 uregex_groupNumberFromCName(URegularExpression *regexp, const char *groupName, int32_t nameLength, UErrorCode *status); /** Extract the string for the specified matching expression or subexpression. * Group #0 is the complete string of matched text. * Group #1 is the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group to extract. Group 0 is the complete * match. The value of this parameter must be * less than or equal to the number of capture groups in * the pattern. * @param dest Buffer to receive the matching string data * @param destCapacity Capacity of the dest buffer. * @param status A reference to a UErrorCode to receive any errors. * @return Length of matching data, * or -1 if no applicable match. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_group(URegularExpression *regexp, int32_t groupNum, UChar *dest, int32_t destCapacity, UErrorCode *status); /** Returns a shallow immutable clone of the entire input string with the current index set * to the beginning of the requested capture group. The capture group length is also * returned via groupLength. * Group #0 is the complete string of matched text. * Group #1 is the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group to extract. Group 0 is the complete * match. The value of this parameter must be * less than or equal to the number of capture groups in * the pattern. * @param dest A mutable UText in which to store the current input. * If NULL, a new UText will be created as an immutable shallow clone * of the entire input string. * @param groupLength The group length of the desired capture group. Output parameter. * @param status A reference to a UErrorCode to receive any errors. * @return The subject text currently associated with this regular expression. * If a pre-allocated UText was provided, it will always be used and returned. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_groupUText(URegularExpression *regexp, int32_t groupNum, UText *dest, int64_t *groupLength, UErrorCode *status); /** * Returns the index in the input string of the start of the text matched by the * specified capture group during the previous match operation. Return -1 if * the capture group was not part of the last match. * Group #0 refers to the complete range of matched text. * Group #1 refers to the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group number * @param status A reference to a UErrorCode to receive any errors. * @return the starting (native) position in the input of the text matched * by the specified group. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_start(URegularExpression *regexp, int32_t groupNum, UErrorCode *status); /** * 64bit version of uregex_start. * Returns the index in the input string of the start of the text matched by the * specified capture group during the previous match operation. Return -1 if * the capture group was not part of the last match. * Group #0 refers to the complete range of matched text. * Group #1 refers to the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group number * @param status A reference to a UErrorCode to receive any errors. * @return the starting (native) position in the input of the text matched * by the specified group. * @stable ICU 4.6 */ U_CAPI int64_t U_EXPORT2 uregex_start64(URegularExpression *regexp, int32_t groupNum, UErrorCode *status); /** * Returns the index in the input string of the position following the end * of the text matched by the specified capture group. * Return -1 if the capture group was not part of the last match. * Group #0 refers to the complete range of matched text. * Group #1 refers to the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group number * @param status A reference to a UErrorCode to receive any errors. * @return the (native) index of the position following the last matched character. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_end(URegularExpression *regexp, int32_t groupNum, UErrorCode *status); /** * 64bit version of uregex_end. * Returns the index in the input string of the position following the end * of the text matched by the specified capture group. * Return -1 if the capture group was not part of the last match. * Group #0 refers to the complete range of matched text. * Group #1 refers to the text matched by the first set of capturing parentheses. * * @param regexp The compiled regular expression. * @param groupNum The capture group number * @param status A reference to a UErrorCode to receive any errors. * @return the (native) index of the position following the last matched character. * @stable ICU 4.6 */ U_CAPI int64_t U_EXPORT2 uregex_end64(URegularExpression *regexp, int32_t groupNum, UErrorCode *status); /** * Reset any saved state from the previous match. Has the effect of * causing uregex_findNext to begin at the specified index, and causing * uregex_start(), uregex_end() and uregex_group() to return an error * indicating that there is no match information available. Clears any * match region that may have been set. * * @param regexp The compiled regular expression. * @param index The position (native) in the text at which a * uregex_findNext() should begin searching. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 3.0 */ U_CAPI void U_EXPORT2 uregex_reset(URegularExpression *regexp, int32_t index, UErrorCode *status); /** * 64bit version of uregex_reset. * Reset any saved state from the previous match. Has the effect of * causing uregex_findNext to begin at the specified index, and causing * uregex_start(), uregex_end() and uregex_group() to return an error * indicating that there is no match information available. Clears any * match region that may have been set. * * @param regexp The compiled regular expression. * @param index The position (native) in the text at which a * uregex_findNext() should begin searching. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_reset64(URegularExpression *regexp, int64_t index, UErrorCode *status); /** * Sets the limits of the matching region for this URegularExpression. * The region is the part of the input string that will be considered when matching. * Invoking this method resets any saved state from the previous match, * then sets the region to start at the index specified by the start parameter * and end at the index specified by the end parameter. * * Depending on the transparency and anchoring being used (see useTransparentBounds * and useAnchoringBounds), certain constructs such as anchors may behave differently * at or around the boundaries of the region * * The function will fail if start is greater than limit, or if either index * is less than zero or greater than the length of the string being matched. * * @param regexp The compiled regular expression. * @param regionStart The (native) index to begin searches at. * @param regionLimit The (native) index to end searches at (exclusive). * @param status A pointer to a UErrorCode to receive any errors. * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_setRegion(URegularExpression *regexp, int32_t regionStart, int32_t regionLimit, UErrorCode *status); /** * 64bit version of uregex_setRegion. * Sets the limits of the matching region for this URegularExpression. * The region is the part of the input string that will be considered when matching. * Invoking this method resets any saved state from the previous match, * then sets the region to start at the index specified by the start parameter * and end at the index specified by the end parameter. * * Depending on the transparency and anchoring being used (see useTransparentBounds * and useAnchoringBounds), certain constructs such as anchors may behave differently * at or around the boundaries of the region * * The function will fail if start is greater than limit, or if either index * is less than zero or greater than the length of the string being matched. * * @param regexp The compiled regular expression. * @param regionStart The (native) index to begin searches at. * @param regionLimit The (native) index to end searches at (exclusive). * @param status A pointer to a UErrorCode to receive any errors. * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_setRegion64(URegularExpression *regexp, int64_t regionStart, int64_t regionLimit, UErrorCode *status); /** * Set the matching region and the starting index for subsequent matches * in a single operation. * This is useful because the usual function for setting the starting * index, urgex_reset(), also resets any region limits. * * @param regexp The compiled regular expression. * @param regionStart The (native) index to begin searches at. * @param regionLimit The (native) index to end searches at (exclusive). * @param startIndex The index in the input text at which the next * match operation should begin. * @param status A pointer to a UErrorCode to receive any errors. * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_setRegionAndStart(URegularExpression *regexp, int64_t regionStart, int64_t regionLimit, int64_t startIndex, UErrorCode *status); /** * Reports the start index of the matching region. Any matches found are limited to * to the region bounded by regionStart (inclusive) and regionEnd (exclusive). * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return The starting (native) index of this matcher's region. * @stable ICU 4.0 */ U_CAPI int32_t U_EXPORT2 uregex_regionStart(const URegularExpression *regexp, UErrorCode *status); /** * 64bit version of uregex_regionStart. * Reports the start index of the matching region. Any matches found are limited to * to the region bounded by regionStart (inclusive) and regionEnd (exclusive). * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return The starting (native) index of this matcher's region. * @stable ICU 4.6 */ U_CAPI int64_t U_EXPORT2 uregex_regionStart64(const URegularExpression *regexp, UErrorCode *status); /** * Reports the end index (exclusive) of the matching region for this URegularExpression. * Any matches found are limited to to the region bounded by regionStart (inclusive) * and regionEnd (exclusive). * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return The ending point (native) of this matcher's region. * @stable ICU 4.0 */ U_CAPI int32_t U_EXPORT2 uregex_regionEnd(const URegularExpression *regexp, UErrorCode *status); /** * 64bit version of uregex_regionEnd. * Reports the end index (exclusive) of the matching region for this URegularExpression. * Any matches found are limited to to the region bounded by regionStart (inclusive) * and regionEnd (exclusive). * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return The ending point (native) of this matcher's region. * @stable ICU 4.6 */ U_CAPI int64_t U_EXPORT2 uregex_regionEnd64(const URegularExpression *regexp, UErrorCode *status); /** * Queries the transparency of region bounds for this URegularExpression. * See useTransparentBounds for a description of transparent and opaque bounds. * By default, matching boundaries are opaque. * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return true if this matcher is using opaque bounds, false if it is not. * @stable ICU 4.0 */ U_CAPI UBool U_EXPORT2 uregex_hasTransparentBounds(const URegularExpression *regexp, UErrorCode *status); /** * Sets the transparency of region bounds for this URegularExpression. * Invoking this function with an argument of true will set matches to use transparent bounds. * If the boolean argument is false, then opaque bounds will be used. * * Using transparent bounds, the boundaries of the matching region are transparent * to lookahead, lookbehind, and boundary matching constructs. Those constructs can * see text beyond the boundaries of the region while checking for a match. * * With opaque bounds, no text outside of the matching region is visible to lookahead, * lookbehind, and boundary matching constructs. * * By default, opaque bounds are used. * * @param regexp The compiled regular expression. * @param b true for transparent bounds; false for opaque bounds * @param status A pointer to a UErrorCode to receive any errors. * @stable ICU 4.0 **/ U_CAPI void U_EXPORT2 uregex_useTransparentBounds(URegularExpression *regexp, UBool b, UErrorCode *status); /** * Return true if this URegularExpression is using anchoring bounds. * By default, anchoring region bounds are used. * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return true if this matcher is using anchoring bounds. * @stable ICU 4.0 */ U_CAPI UBool U_EXPORT2 uregex_hasAnchoringBounds(const URegularExpression *regexp, UErrorCode *status); /** * Set whether this URegularExpression is using Anchoring Bounds for its region. * With anchoring bounds, pattern anchors such as ^ and $ will match at the start * and end of the region. Without Anchoring Bounds, anchors will only match at * the positions they would in the complete text. * * Anchoring Bounds are the default for regions. * * @param regexp The compiled regular expression. * @param b true if to enable anchoring bounds; false to disable them. * @param status A pointer to a UErrorCode to receive any errors. * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_useAnchoringBounds(URegularExpression *regexp, UBool b, UErrorCode *status); /** * Return true if the most recent matching operation touched the * end of the text being processed. In this case, additional input text could * change the results of that match. * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return true if the most recent match hit the end of input * @stable ICU 4.0 */ U_CAPI UBool U_EXPORT2 uregex_hitEnd(const URegularExpression *regexp, UErrorCode *status); /** * Return true the most recent match succeeded and additional input could cause * it to fail. If this function returns false and a match was found, then more input * might change the match but the match won't be lost. If a match was not found, * then requireEnd has no meaning. * * @param regexp The compiled regular expression. * @param status A pointer to a UErrorCode to receive any errors. * @return true if more input could cause the most recent match to no longer match. * @stable ICU 4.0 */ U_CAPI UBool U_EXPORT2 uregex_requireEnd(const URegularExpression *regexp, UErrorCode *status); /** * Replaces every substring of the input that matches the pattern * with the given replacement string. This is a convenience function that * provides a complete find-and-replace-all operation. * * This method scans the input string looking for matches of the pattern. * Input that is not part of any match is copied unchanged to the * destination buffer. Matched regions are replaced in the output * buffer by the replacement string. The replacement string may contain * references to capture groups; these take the form of $1, $2, etc. * * @param regexp The compiled regular expression. * @param replacementText A string containing the replacement text. * @param replacementLength The length of the replacement string, or * -1 if it is NUL terminated. * @param destBuf A (UChar *) buffer that will receive the result. * @param destCapacity The capacity of the destination buffer. * @param status A reference to a UErrorCode to receive any errors. * @return The length of the string resulting from the find * and replace operation. In the event that the * destination capacity is inadequate, the return value * is still the full length of the untruncated string. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_replaceAll(URegularExpression *regexp, const UChar *replacementText, int32_t replacementLength, UChar *destBuf, int32_t destCapacity, UErrorCode *status); /** * Replaces every substring of the input that matches the pattern * with the given replacement string. This is a convenience function that * provides a complete find-and-replace-all operation. * * This method scans the input string looking for matches of the pattern. * Input that is not part of any match is copied unchanged to the * destination buffer. Matched regions are replaced in the output * buffer by the replacement string. The replacement string may contain * references to capture groups; these take the form of $1, $2, etc. * * @param regexp The compiled regular expression. * @param replacement A string containing the replacement text. * @param dest A mutable UText that will receive the result. * If NULL, a new UText will be created (which may not be mutable). * @param status A reference to a UErrorCode to receive any errors. * @return A UText containing the results of the find and replace. * If a pre-allocated UText was provided, it will always be used and returned. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_replaceAllUText(URegularExpression *regexp, UText *replacement, UText *dest, UErrorCode *status); /** * Replaces the first substring of the input that matches the pattern * with the given replacement string. This is a convenience function that * provides a complete find-and-replace operation. * * This method scans the input string looking for a match of the pattern. * All input that is not part of the match is copied unchanged to the * destination buffer. The matched region is replaced in the output * buffer by the replacement string. The replacement string may contain * references to capture groups; these take the form of $1, $2, etc. * * @param regexp The compiled regular expression. * @param replacementText A string containing the replacement text. * @param replacementLength The length of the replacement string, or * -1 if it is NUL terminated. * @param destBuf A (UChar *) buffer that will receive the result. * @param destCapacity The capacity of the destination buffer. * @param status a reference to a UErrorCode to receive any errors. * @return The length of the string resulting from the find * and replace operation. In the event that the * destination capacity is inadequate, the return value * is still the full length of the untruncated string. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_replaceFirst(URegularExpression *regexp, const UChar *replacementText, int32_t replacementLength, UChar *destBuf, int32_t destCapacity, UErrorCode *status); /** * Replaces the first substring of the input that matches the pattern * with the given replacement string. This is a convenience function that * provides a complete find-and-replace operation. * * This method scans the input string looking for a match of the pattern. * All input that is not part of the match is copied unchanged to the * destination buffer. The matched region is replaced in the output * buffer by the replacement string. The replacement string may contain * references to capture groups; these take the form of $1, $2, etc. * * @param regexp The compiled regular expression. * @param replacement A string containing the replacement text. * @param dest A mutable UText that will receive the result. * If NULL, a new UText will be created (which may not be mutable). * @param status A reference to a UErrorCode to receive any errors. * @return A UText containing the results of the find and replace. * If a pre-allocated UText was provided, it will always be used and returned. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_replaceFirstUText(URegularExpression *regexp, UText *replacement, UText *dest, UErrorCode *status); /** * Implements a replace operation intended to be used as part of an * incremental find-and-replace. * * The input string, starting from the end of the previous match and ending at * the start of the current match, is appended to the destination string. Then the * replacement string is appended to the output string, * including handling any substitutions of captured text. * * A note on preflight computation of buffersize and error handling: * Calls to uregex_appendReplacement() and uregex_appendTail() are * designed to be chained, one after another, with the destination * buffer pointer and buffer capacity updated after each in preparation * to for the next. If the destination buffer is exhausted partway through such a * sequence, a U_BUFFER_OVERFLOW_ERROR status will be returned. Normal * ICU conventions are for a function to perform no action if it is * called with an error status, but for this one case, uregex_appendRepacement() * will operate normally so that buffer size computations will complete * correctly. * * For simple, prepackaged, non-incremental find-and-replace * operations, see replaceFirst() or replaceAll(). * * @param regexp The regular expression object. * @param replacementText The string that will replace the matched portion of the * input string as it is copied to the destination buffer. * The replacement text may contain references ($1, for * example) to capture groups from the match. * @param replacementLength The length of the replacement text string, * or -1 if the string is NUL terminated. * @param destBuf The buffer into which the results of the * find-and-replace are placed. On return, this pointer * will be updated to refer to the beginning of the * unused portion of buffer, leaving it in position for * a subsequent call to this function. * @param destCapacity The size of the output buffer, On return, this * parameter will be updated to reflect the space remaining * unused in the output buffer. * @param status A reference to a UErrorCode to receive any errors. * @return The length of the result string. In the event that * destCapacity is inadequate, the full length of the * untruncated output string is returned. * * @stable ICU 3.0 * */ U_CAPI int32_t U_EXPORT2 uregex_appendReplacement(URegularExpression *regexp, const UChar *replacementText, int32_t replacementLength, UChar **destBuf, int32_t *destCapacity, UErrorCode *status); /** * Implements a replace operation intended to be used as part of an * incremental find-and-replace. * * The input string, starting from the end of the previous match and ending at * the start of the current match, is appended to the destination string. Then the * replacement string is appended to the output string, * including handling any substitutions of captured text. * * For simple, prepackaged, non-incremental find-and-replace * operations, see replaceFirst() or replaceAll(). * * @param regexp The regular expression object. * @param replacementText The string that will replace the matched portion of the * input string as it is copied to the destination buffer. * The replacement text may contain references ($1, for * example) to capture groups from the match. * @param dest A mutable UText that will receive the result. Must not be NULL. * @param status A reference to a UErrorCode to receive any errors. * * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_appendReplacementUText(URegularExpression *regexp, UText *replacementText, UText *dest, UErrorCode *status); /** * As the final step in a find-and-replace operation, append the remainder * of the input string, starting at the position following the last match, * to the destination string. <code>uregex_appendTail()</code> is intended * to be invoked after one or more invocations of the * <code>uregex_appendReplacement()</code> function. * * @param regexp The regular expression object. This is needed to * obtain the input string and with the position * of the last match within it. * @param destBuf The buffer in which the results of the * find-and-replace are placed. On return, the pointer * will be updated to refer to the beginning of the * unused portion of buffer. * @param destCapacity The size of the output buffer, On return, this * value will be updated to reflect the space remaining * unused in the output buffer. * @param status A reference to a UErrorCode to receive any errors. * @return The length of the result string. In the event that * destCapacity is inadequate, the full length of the * untruncated output string is returned. * * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_appendTail(URegularExpression *regexp, UChar **destBuf, int32_t *destCapacity, UErrorCode *status); /** * As the final step in a find-and-replace operation, append the remainder * of the input string, starting at the position following the last match, * to the destination string. <code>uregex_appendTailUText()</code> is intended * to be invoked after one or more invocations of the * <code>uregex_appendReplacementUText()</code> function. * * @param regexp The regular expression object. This is needed to * obtain the input string and with the position * of the last match within it. * @param dest A mutable UText that will receive the result. Must not be NULL. * * @param status Error code * * @return The destination UText. * * @stable ICU 4.6 */ U_CAPI UText * U_EXPORT2 uregex_appendTailUText(URegularExpression *regexp, UText *dest, UErrorCode *status); /** * Split a string into fields. Somewhat like split() from Perl. * The pattern matches identify delimiters that separate the input * into fields. The input data between the matches becomes the * fields themselves. * * Each of the fields is copied from the input string to the destination * buffer, and NUL terminated. The position of each field within * the destination buffer is returned in the destFields array. * * If the delimiter pattern includes capture groups, the captured text will * also appear in the destination array of output strings, interspersed * with the fields. This is similar to Perl, but differs from Java, * which ignores the presence of capture groups in the pattern. * * Trailing empty fields will always be returned, assuming sufficient * destination capacity. This differs from the default behavior for Java * and Perl where trailing empty fields are not returned. * * The number of strings produced by the split operation is returned. * This count includes the strings from capture groups in the delimiter pattern. * This behavior differs from Java, which ignores capture groups. * * @param regexp The compiled regular expression. * @param destBuf A (UChar *) buffer to receive the fields that * are extracted from the input string. These * field pointers will refer to positions within the * destination buffer supplied by the caller. Any * extra positions within the destFields array will be * set to NULL. * @param destCapacity The capacity of the destBuf. * @param requiredCapacity The actual capacity required of the destBuf. * If destCapacity is too small, requiredCapacity will return * the total capacity required to hold all of the output, and * a U_BUFFER_OVERFLOW_ERROR will be returned. * @param destFields An array to be filled with the position of each * of the extracted fields within destBuf. * @param destFieldsCapacity The number of elements in the destFields array. * If the number of fields found is less than destFieldsCapacity, * the extra destFields elements are set to zero. * If destFieldsCapacity is too small, the trailing part of the * input, including any field delimiters, is treated as if it * were the last field - it is copied to the destBuf, and * its position is in the destBuf is stored in the last element * of destFields. This behavior mimics that of Perl. It is not * an error condition, and no error status is returned when all destField * positions are used. * @param status A reference to a UErrorCode to receive any errors. * @return The number of fields into which the input string was split. * @stable ICU 3.0 */ U_CAPI int32_t U_EXPORT2 uregex_split( URegularExpression *regexp, UChar *destBuf, int32_t destCapacity, int32_t *requiredCapacity, UChar *destFields[], int32_t destFieldsCapacity, UErrorCode *status); /** * Split a string into fields. Somewhat like split() from Perl. * The pattern matches identify delimiters that separate the input * into fields. The input data between the matches becomes the * fields themselves. * * The behavior of this function is not very closely aligned with uregex_split(); * instead, it is based on (and implemented directly on top of) the C++ split method. * * @param regexp The compiled regular expression. * @param destFields An array of mutable UText structs to receive the results of the split. * If a field is NULL, a new UText is allocated to contain the results for * that field. This new UText is not guaranteed to be mutable. * @param destFieldsCapacity The number of elements in the destination array. * If the number of fields found is less than destCapacity, the * extra strings in the destination array are not altered. * If the number of destination strings is less than the number * of fields, the trailing part of the input string, including any * field delimiters, is placed in the last destination string. * This behavior mimics that of Perl. It is not an error condition, and no * error status is returned when all destField positions are used. * @param status A reference to a UErrorCode to receive any errors. * @return The number of fields into which the input string was split. * * @stable ICU 4.6 */ U_CAPI int32_t U_EXPORT2 uregex_splitUText(URegularExpression *regexp, UText *destFields[], int32_t destFieldsCapacity, UErrorCode *status); /** * Set a processing time limit for match operations with this URegularExpression. * * Some patterns, when matching certain strings, can run in exponential time. * For practical purposes, the match operation may appear to be in an * infinite loop. * When a limit is set a match operation will fail with an error if the * limit is exceeded. * * The units of the limit are steps of the match engine. * Correspondence with actual processor time will depend on the speed * of the processor and the details of the specific pattern, but will * typically be on the order of milliseconds. * * By default, the matching time is not limited. * * * @param regexp The compiled regular expression. * @param limit The limit value, or 0 for no limit. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_setTimeLimit(URegularExpression *regexp, int32_t limit, UErrorCode *status); /** * Get the time limit for for matches with this URegularExpression. * A return value of zero indicates that there is no limit. * * @param regexp The compiled regular expression. * @param status A reference to a UErrorCode to receive any errors. * @return the maximum allowed time for a match, in units of processing steps. * @stable ICU 4.0 */ U_CAPI int32_t U_EXPORT2 uregex_getTimeLimit(const URegularExpression *regexp, UErrorCode *status); /** * Set the amount of heap storage available for use by the match backtracking stack. * * ICU uses a backtracking regular expression engine, with the backtrack stack * maintained on the heap. This function sets the limit to the amount of memory * that can be used for this purpose. A backtracking stack overflow will * result in an error from the match operation that caused it. * * A limit is desirable because a malicious or poorly designed pattern can use * excessive memory, potentially crashing the process. A limit is enabled * by default. * * @param regexp The compiled regular expression. * @param limit The maximum size, in bytes, of the matching backtrack stack. * A value of zero means no limit. * The limit must be greater than or equal to zero. * @param status A reference to a UErrorCode to receive any errors. * * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_setStackLimit(URegularExpression *regexp, int32_t limit, UErrorCode *status); /** * Get the size of the heap storage available for use by the back tracking stack. * * @return the maximum backtracking stack size, in bytes, or zero if the * stack size is unlimited. * @stable ICU 4.0 */ U_CAPI int32_t U_EXPORT2 uregex_getStackLimit(const URegularExpression *regexp, UErrorCode *status); /** * Function pointer for a regular expression matching callback function. * When set, a callback function will be called periodically during matching * operations. If the call back function returns false, the matching * operation will be terminated early. * * Note: the callback function must not call other functions on this * URegularExpression. * * @param context context pointer. The callback function will be invoked * with the context specified at the time that * uregex_setMatchCallback() is called. * @param steps the accumulated processing time, in match steps, * for this matching operation. * @return true to continue the matching operation. * false to terminate the matching operation. * @stable ICU 4.0 */ U_CDECL_BEGIN typedef UBool U_CALLCONV URegexMatchCallback ( const void *context, int32_t steps); U_CDECL_END /** * Set a callback function for this URegularExpression. * During matching operations the function will be called periodically, * giving the application the opportunity to terminate a long-running * match. * * @param regexp The compiled regular expression. * @param callback A pointer to the user-supplied callback function. * @param context User context pointer. The value supplied at the * time the callback function is set will be saved * and passed to the callback each time that it is called. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_setMatchCallback(URegularExpression *regexp, URegexMatchCallback *callback, const void *context, UErrorCode *status); /** * Get the callback function for this URegularExpression. * * @param regexp The compiled regular expression. * @param callback Out parameter, receives a pointer to the user-supplied * callback function. * @param context Out parameter, receives the user context pointer that * was set when uregex_setMatchCallback() was called. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.0 */ U_CAPI void U_EXPORT2 uregex_getMatchCallback(const URegularExpression *regexp, URegexMatchCallback **callback, const void **context, UErrorCode *status); /** * Function pointer for a regular expression find callback function. * * When set, a callback function will be called during a find operation * and for operations that depend on find, such as findNext, split and some replace * operations like replaceFirst. * The callback will usually be called after each attempt at a match, but this is not a * guarantee that the callback will be invoked at each character. For finds where the * match engine is invoked at each character, this may be close to true, but less likely * for more optimized loops where the pattern is known to only start, and the match * engine invoked, at certain characters. * When invoked, this callback will specify the index at which a match operation is about * to be attempted, giving the application the opportunity to terminate a long-running * find operation. * * If the call back function returns false, the find operation will be terminated early. * * Note: the callback function must not call other functions on this * URegularExpression * * @param context context pointer. The callback function will be invoked * with the context specified at the time that * uregex_setFindProgressCallback() is called. * @param matchIndex the next index at which a match attempt will be attempted for this * find operation. If this callback interrupts the search, this is the * index at which a find/findNext operation may be re-initiated. * @return true to continue the matching operation. * false to terminate the matching operation. * @stable ICU 4.6 */ U_CDECL_BEGIN typedef UBool U_CALLCONV URegexFindProgressCallback ( const void *context, int64_t matchIndex); U_CDECL_END /** * Set the find progress callback function for this URegularExpression. * * @param regexp The compiled regular expression. * @param callback A pointer to the user-supplied callback function. * @param context User context pointer. The value supplied at the * time the callback function is set will be saved * and passed to the callback each time that it is called. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_setFindProgressCallback(URegularExpression *regexp, URegexFindProgressCallback *callback, const void *context, UErrorCode *status); /** * Get the find progress callback function for this URegularExpression. * * @param regexp The compiled regular expression. * @param callback Out parameter, receives a pointer to the user-supplied * callback function. * @param context Out parameter, receives the user context pointer that * was set when uregex_setFindProgressCallback() was called. * @param status A reference to a UErrorCode to receive any errors. * @stable ICU 4.6 */ U_CAPI void U_EXPORT2 uregex_getFindProgressCallback(const URegularExpression *regexp, URegexFindProgressCallback **callback, const void **context, UErrorCode *status); #endif /* !UCONFIG_NO_REGULAR_EXPRESSIONS */ #endif /* UREGEX_H */