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+/*
+**********************************************************************
+* Copyright (C) 2004-2008, International Business Machines
+* Corporation and others. All Rights Reserved.
+**********************************************************************
+* file name: regex.h
+* encoding: US-ASCII
+* indentation:4
+*
+* created on: 2004mar09
+* created by: Andy Heninger
+*
+* ICU Regular Expressions, API for C
+*/
+
+/**
+ * \file
+ * \brief C API: Regular Expressions
+ *
+ * <p>This is a C wrapper around the C++ RegexPattern and RegexMatcher
classes.</p>
+ */
+
+#ifndef UREGEX_H
+#define UREGEX_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_REGULAR_EXPRESSIONS
+
+#include "unicode/parseerr.h"
+
+struct URegularExpression;
+/**
+ * Structure represeting a compiled regular rexpression, 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
+ /** 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 flags CASE_INSENSITIVE and UNICODE_CASE retain their impact
+ * on matching when used in conjunction with this flag.
+ * The other flags become superfluous.
+ * TODO: say which escapes are still handled; anything Java does
+ * early (\u) we should still do.
+ * @draft 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 $.
+ * @draft 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 specail
+ * meaning. If this flag is not set, these
+ * escaped letters represent themselves.
+ * @draft 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 termintated.
+ * @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 nubers) 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_STABLE URegularExpression * U_EXPORT2
+uregex_open( const UChar *pattern,
+ int32_t patternLength,
+ uint32_t flags,
+ UParseError *pe,
+ UErrorCode *status);
+
+/**
+ * Open (compile) an ICU regular expression. The resulting regular
expression
+ * handle can then be used to perform various matching operations.
+ * <p>
+ * 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 termintated.
+ * @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 nubers) 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
+ */
+#if !UCONFIG_NO_CONVERSION
+U_STABLE 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_STABLE void U_EXPORT2
+uregex_close(URegularExpression *regexp);
+
+/**
+ * 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.
+ * <p>
+ * Note that the current input string and the position of any matched text
+ * within it are not cloned; only the pattern itself and and the
+ * match mode flags are copied.
+ * <p>
+ * 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_STABLE URegularExpression * U_EXPORT2
+uregex_clone(const URegularExpression *regexp, UErrorCode *status);
+
+/**
+ * Return a pointer to the source form of the pattern for this regular
expression.
+ *
+ * @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_STABLE const UChar * U_EXPORT2
+uregex_pattern(const URegularExpression *regexp,
+ int32_t *patLength,
+ 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_STABLE 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.
+ * <p>
+ * 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.
+ * <p>
+ * 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_STABLE void U_EXPORT2
+uregex_setText(URegularExpression *regexp,
+ const UChar *text,
+ int32_t textLength,
+ UErrorCode *status);
+
+/**
+ * Get the subject text that is currently associated with this
+ * regular expression object. This simply returns whatever string
+ * pointer was previously supplied via uregex_setText().
+ *
+ * @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 Poiner to the subject text string currently associated
with
+ * this regular expression.
+ * @stable ICU 3.0
+ */
+U_STABLE const UChar * U_EXPORT2
+uregex_getText(URegularExpression *regexp,
+ int32_t *textLength,
+ 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 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_STABLE UBool U_EXPORT2
+uregex_matches(URegularExpression *regexp,
+ int32_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().
+ *
+ * <p>If startIndex is >= 0 any input region that was set for this
+ * URegularExpression is reset before the operation begins.
+ *
+ * <p>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.
+ *
+ * <p>If the match succeeds then more information can be obtained via the
+ * <code>uregexp_start()</code>, <code>uregexp_end()</code>,
+ * and <code>uregexp_group()</code> functions.</p>
+ *
+ * @param regexp The compiled regular expression.
+ * @param startIndex The input string 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_STABLE UBool U_EXPORT2
+uregex_lookingAt(URegularExpression *regexp,
+ int32_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 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_STABLE UBool U_EXPORT2
+uregex_find(URegularExpression *regexp,
+ int32_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_STABLE 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_STABLE int32_t U_EXPORT2
+uregex_groupCount(URegularExpression *regexp,
+ 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_STABLE int32_t U_EXPORT2
+uregex_group(URegularExpression *regexp,
+ int32_t groupNum,
+ UChar *dest,
+ int32_t destCapacity,
+ 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 position in the input of the text
matched
+ * by the specified group.
+ * @stable ICU 3.0
+ */
+U_STABLE int32_t U_EXPORT2
+uregex_start(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 index of the position following the last
matched character.
+ * @stable ICU 3.0
+ */
+U_STABLE int32_t U_EXPORT2
+uregex_end(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 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_STABLE void U_EXPORT2
+uregex_reset(URegularExpression *regexp,
+ int32_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 index to begin searches at.
+ * @param regionLimit The index to end searches at (exclusive).
+ * @param status A pointer to a UErrorCode to receive any errors.
+ * @draft ICU 4.0
+ */
+U_DRAFT void U_EXPORT2
+uregex_setRegion(URegularExpression *regexp,
+ int32_t regionStart,
+ int32_t regionLimit,
+ 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 index of this matcher's region.
+ * @draft ICU 4.0
+ */
+U_DRAFT int32_t U_EXPORT2
+uregex_regionStart(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 of this matcher's region.
+ * @draft ICU 4.0
+ */
+U_DRAFT int32_t U_EXPORT2
+uregex_regionEnd(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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft ICU 4.0
+ **/
+U_DRAFT 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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 desitnation 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_STABLE int32_t U_EXPORT2
+uregex_replaceAll(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 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 desitnation 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_STABLE int32_t U_EXPORT2
+uregex_replaceFirst(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.
+ *
+ * <p>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.</p>
+ *
+ * <p>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.
+ *
+ * <p>For simple, prepackaged, non-incremental find-and-replace
+ * operations, see replaceFirst() or replaceAll().</p>
+ *
+ * @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_STABLE int32_t U_EXPORT2
+uregex_appendReplacement(URegularExpression *regexp,
+ const UChar *replacementText,
+ int32_t replacementLength,
+ 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_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_STABLE int32_t U_EXPORT2
+uregex_appendTail(URegularExpression *regexp,
+ UChar **destBuf,
+ int32_t *destCapacity,
+ 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.
+ * <p>
+ * Each of the fields is copied from the input string to the destination
+ * buffer, and the NUL terminated. The position of each field within
+ * the destination buffer is returned in the destFields array.
+ *
+ * Note: another choice for the design of this function would be to not
+ * copy the resulting fields at all, but to return indexes and
+ * lengths within the source text.
+ * Advantages would be
+ * o Faster. No Copying.
+ * o Nothing extra needed when field data may contain embedded
NUL chars.
+ * o Less memory needed if working on large data.
+ * Disadvantages
+ * o Less consistent with C++ split, which copies into an
+ * array of UnicodeStrings.
+ * o No NUL termination, extracted fields would be less
convenient
+ * to use in most cases.
+ * o Possible problems in the future, when support Unicode
Normalization
+ * could cause the fields to not correspond exactly to
+ * a range of the source text.
+ *
+ * @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_STABLE int32_t U_EXPORT2
+uregex_split( URegularExpression *regexp,
+ UChar *destBuf,
+ int32_t destCapacity,
+ int32_t *requiredCapacity,
+ UChar *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.
+ * <p>
+ * 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.
+ * <p>
+ * By default, the matching time is not limited.
+ * <p>
+ *
+ * @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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT int32_t U_EXPORT2
+uregex_getTimeLimit(const URegularExpression *regexp,
+ UErrorCode *status);
+
+/**
+ * Set the amount of heap storage avaliable for use by the match backtracking
stack.
+ * <p>
+ * 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.
+ * <p>
+ * 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.
+ * <p>
+ * @param regexp The compiled regular expression.
+ * @param limit The maximum size, in bytes, of the matching backtrack
stack.
+ * A value of -1 means no limit.
+ * The limit must be greater than zero, or -1.
+ * @param status A reference to a UErrorCode to receive any errors.
+ *
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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.
+ * @draft 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT 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 paramater, 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.
+ * @draft ICU 4.0
+ */
+U_DRAFT void U_EXPORT2
+uregex_getMatchCallback(const URegularExpression *regexp,
+ URegexMatchCallback **callback,
+ const void **context,
+ UErrorCode *status);
+
+
+
+#endif /* !UCONFIG_NO_REGULAR_EXPRESSIONS */
+#endif /* UREGEX_H */
