diff options
Diffstat (limited to 'src/corelib/tools/qregexp.cpp')
| -rw-r--r-- | src/corelib/tools/qregexp.cpp | 68 |
1 files changed, 24 insertions, 44 deletions
diff --git a/src/corelib/tools/qregexp.cpp b/src/corelib/tools/qregexp.cpp index 1db0fcf44c..e2167c5999 100644 --- a/src/corelib/tools/qregexp.cpp +++ b/src/corelib/tools/qregexp.cpp @@ -437,7 +437,7 @@ int qFindString(const QChar *haystack, int haystackLen, int from, When the number of matches cannot be determined in advance, a common idiom is to use cap() in a loop. For example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 0 + \snippet code/src_corelib_tools_qregexp.cpp 0 \target assertions \section1 Assertions @@ -532,7 +532,7 @@ int qFindString(const QChar *haystack, int haystackLen, int from, To test a string against a wildcard expression, use exactMatch(). For example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 1 + \snippet code/src_corelib_tools_qregexp.cpp 1 \target perl-users \section1 Notes for Perl Users @@ -555,7 +555,7 @@ int qFindString(const QChar *haystack, int haystackLen, int from, applied to all the quantifiers in the pattern. For example, to match the Perl regexp \b{ro+?m} requires: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 2 + \snippet code/src_corelib_tools_qregexp.cpp 2 The equivalent of Perl's \c{/i} option is setCaseSensitivity(Qt::CaseInsensitive). @@ -584,7 +584,7 @@ int qFindString(const QChar *haystack, int haystackLen, int from, the other hand, C++'s rules for literal strings can be used to achieve the same: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 3 + \snippet code/src_corelib_tools_qregexp.cpp 3 Both zero-width positive and zero-width negative lookahead assertions (?=pattern) and (?!pattern) are supported with the same @@ -603,12 +603,12 @@ int qFindString(const QChar *haystack, int haystackLen, int from, \target code-examples \section1 Code Examples - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 4 + \snippet code/src_corelib_tools_qregexp.cpp 4 The third string matches '\underline{6}'. This is a simple validation regexp for integers in the range 0 to 99. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 5 + \snippet code/src_corelib_tools_qregexp.cpp 5 The second string matches '\underline{This_is-OK}'. We've used the character set abbreviation '\\S' (non-whitespace) and the anchors @@ -618,25 +618,25 @@ int qFindString(const QChar *haystack, int haystackLen, int from, 'letter' or 'correspondence' but only match whole words i.e. not 'email' - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 6 + \snippet code/src_corelib_tools_qregexp.cpp 6 The second string matches "Please write the \underline{letter}". The word 'letter' is also captured (because of the parentheses). We can see what text we've captured like this: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 7 + \snippet code/src_corelib_tools_qregexp.cpp 7 This will capture the text from the first set of capturing parentheses (counting capturing left parentheses from left to right). The parentheses are counted from 1 since cap(0) is the whole matched regexp (equivalent to '&' in most regexp engines). - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 8 + \snippet code/src_corelib_tools_qregexp.cpp 8 Here we've passed the QRegExp to QString's replace() function to replace the matched text with new text. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 9 + \snippet code/src_corelib_tools_qregexp.cpp 9 We've used the indexIn() function to repeatedly match the regexp in the string. Note that instead of moving forward by one character @@ -650,7 +650,7 @@ int qFindString(const QChar *haystack, int haystackLen, int from, One common use of regexps is to split lines of delimited data into their component fields. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 10 + \snippet code/src_corelib_tools_qregexp.cpp 10 In this example our input lines have the format company name, web address and country. Unfortunately the regexp is rather long and @@ -660,13 +660,13 @@ int qFindString(const QChar *haystack, int haystackLen, int from, QString::split() function can take a separator string or regexp as an argument and split a string accordingly. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 11 + \snippet code/src_corelib_tools_qregexp.cpp 11 Here field[0] is the company, field[1] the web address and so on. To imitate the matching of a shell we can use wildcard mode. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 12 + \snippet code/src_corelib_tools_qregexp.cpp 12 Wildcard matching can be convenient because of its simplicity, but any wildcard regexp can be defined using full regexps, e.g. @@ -4204,7 +4204,6 @@ void QRegExp::setMinimal(bool minimal) priv->minimal = minimal; } -// ### Qt 5: make non-const /*! Returns true if \a str is matched exactly by this regular expression; otherwise returns false. You can determine how much of @@ -4220,12 +4219,9 @@ void QRegExp::setMinimal(bool minimal) bluebell, \c blutak and \c lightblue, exactMatch() returns false and matchedLength() will return 4, 3 and 0 respectively. - Although const, this function sets matchedLength(), - capturedTexts(), and pos(). - \sa indexIn(), lastIndexIn() */ -bool QRegExp::exactMatch(const QString &str) const +bool QRegExp::exactMatch(const QString &str) { prepareEngineForMatch(priv, str); priv->matchState.match(str.unicode(), str.length(), 0, priv->minimal, true, 0); @@ -4238,7 +4234,6 @@ bool QRegExp::exactMatch(const QString &str) const } } -// ### Qt 5: make non-const /*! Attempts to find a match in \a str from position \a offset (0 by default). If \a offset is -1, the search starts at the last @@ -4255,10 +4250,7 @@ bool QRegExp::exactMatch(const QString &str) const QString::replace(). Example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 13 - - Although const, this function sets matchedLength(), - capturedTexts() and pos(). + \snippet code/src_corelib_tools_qregexp.cpp 13 If the QRegExp is a wildcard expression (see setPatternSyntax()) and want to test a string against the whole wildcard expression, @@ -4267,7 +4259,7 @@ bool QRegExp::exactMatch(const QString &str) const \sa lastIndexIn(), exactMatch() */ -int QRegExp::indexIn(const QString &str, int offset, CaretMode caretMode) const +int QRegExp::indexIn(const QString &str, int offset, CaretMode caretMode) { prepareEngineForMatch(priv, str); if (offset < 0) @@ -4277,7 +4269,6 @@ int QRegExp::indexIn(const QString &str, int offset, CaretMode caretMode) const return priv->matchState.captured[0]; } -// ### Qt 5: make non-const /*! Attempts to find a match backwards in \a str from position \a offset. If \a offset is -1 (the default), the search starts at the @@ -4289,16 +4280,13 @@ int QRegExp::indexIn(const QString &str, int offset, CaretMode caretMode) const The \a caretMode parameter can be used to instruct whether \b{^} should match at index 0 or at \a offset. - Although const, this function sets matchedLength(), - capturedTexts() and pos(). - \warning Searching backwards is much slower than searching forwards. \sa indexIn(), exactMatch() */ -int QRegExp::lastIndexIn(const QString &str, int offset, CaretMode caretMode) const +int QRegExp::lastIndexIn(const QString &str, int offset, CaretMode caretMode) { prepareEngineForMatch(priv, str); if (offset < 0) @@ -4332,14 +4320,6 @@ int QRegExp::matchedLength() const #ifndef QT_NO_REGEXP_CAPTURE /*! - \fn int QRegExp::numCaptures() const - \obsolete - Returns the number of captures contained in the regular expression. - - \sa captureCount() - */ - -/*! \since 4.6 Returns the number of captures contained in the regular expression. */ @@ -4357,17 +4337,17 @@ int QRegExp::captureCount() const (capturing) subexpression of the regexp. For example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 14 + \snippet code/src_corelib_tools_qregexp.cpp 14 The above example also captures elements that may be present but which we have no interest in. This problem can be solved by using non-capturing parentheses: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 15 + \snippet code/src_corelib_tools_qregexp.cpp 15 Note that if you want to iterate over the list, you should iterate over a copy, e.g. - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 16 + \snippet code/src_corelib_tools_qregexp.cpp 16 Some regexps can match an indeterminate number of times. For example if the input string is "Offsets: 12 14 99 231 7" and the @@ -4420,7 +4400,7 @@ QStringList QRegExp::capturedTexts() match has index 0 and the parenthesized subexpressions have indexes starting from 1 (excluding non-capturing parentheses). - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 17 + \snippet code/src_corelib_tools_qregexp.cpp 17 The order of elements matched by cap() is as follows. The first element, cap(0), is the entire matching string. Each subsequent @@ -4449,7 +4429,7 @@ QString QRegExp::cap(int nth) of the whole match. Example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 18 + \snippet code/src_corelib_tools_qregexp.cpp 18 For zero-length matches, pos() always returns -1. (For example, if cap(4) would return an empty string, pos(4) returns -1.) This is @@ -4504,11 +4484,11 @@ QString QRegExp::errorString() Example: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 19 + \snippet code/src_corelib_tools_qregexp.cpp 19 This function is useful to construct regexp patterns dynamically: - \snippet doc/src/snippets/code/src_corelib_tools_qregexp.cpp 20 + \snippet code/src_corelib_tools_qregexp.cpp 20 \sa setPatternSyntax() */ |