QRegularExpressionMatch 类

The QRegularExpressionMatch class provides the results of a matching a QRegularExpression 与字符串。 更多...

头: #include <QRegularExpressionMatch>
qmake: QT += core
Since: Qt 5.0

注意: 此类的所有函数 可重入 .

公共函数

QRegularExpressionMatch ()
QRegularExpressionMatch (const QRegularExpressionMatch & match )
~QRegularExpressionMatch ()
QString captured (int nth = 0) const
QString captured (const QString & name ) const
QString captured (QStringView name ) const
int capturedEnd (int nth = 0) const
int capturedEnd (const QString & name ) const
int capturedEnd (QStringView name ) const
int capturedLength (int nth = 0) const
int capturedLength (const QString & name ) const
int capturedLength (QStringView name ) const
QStringRef capturedRef (int nth = 0) const
QStringRef capturedRef (const QString & name ) const
QStringRef capturedRef (QStringView name ) const
int capturedStart (int nth = 0) const
int capturedStart (const QString & name ) const
int capturedStart (QStringView name ) const
QStringList capturedTexts () const
QStringView capturedView (int nth = 0) const
QStringView capturedView (QStringView name ) const
bool hasMatch () const
bool hasPartialMatch () const
bool isValid () const
int lastCapturedIndex () const
QRegularExpression::MatchOptions matchOptions () const
QRegularExpression::MatchType matchType () const
QRegularExpression regularExpression () const
void swap (QRegularExpressionMatch & other )
QRegularExpressionMatch & operator= (const QRegularExpressionMatch & match )
QRegularExpressionMatch & operator= (QRegularExpressionMatch && match )
QDebug operator<< (QDebug debug , const QRegularExpressionMatch & match )

详细描述

The QRegularExpressionMatch class provides the results of a matching a QRegularExpression 与字符串。

A QRegularExpressionMatch object can be obtained by calling the QRegularExpression::match () 函数,或作为全局匹配的单个结果来自 QRegularExpressionMatchIterator .

The success or the failure of a match attempt can be inspected by calling the hasMatch () 函数。 QRegularExpressionMatch also reports a successful partial match through the hasPartialMatch () 函数。

此外, QRegularExpressionMatch returns the substrings captured by the capturing groups in the pattern string. The implicit capturing group with index 0 captures the result of the whole match. The captured () function returns each substring captured, either by the capturing group's index or by its name:

QRegularExpression re("(\\d\\d) (?<name>\\w+)");
QRegularExpressionMatch match = re.match("23 Jordan");
if (match.hasMatch()) {
    QString number = match.captured(1); // first == "23"
    QString name = match.captured("name"); // name == "Jordan"
}
					

For each captured substring it is possible to query its starting and ending offsets in the subject string by calling the capturedStart () 和 capturedEnd () function, respectively. The length of each captured substring is available using the capturedLength () 函数。

The convenience function capturedTexts () 会返回 all the captured substrings at once (including the substring matched by the entire pattern) in the order they have been captured by captring groups; that is, captured(i) == capturedTexts().at(i) .

可以检索 QRegularExpression object the subject string was matched against by calling the regularExpression () function; the match type and the match options are available as well by calling the matchType () 和 matchOptions () 分别。

请参考 QRegularExpression 文档编制,了解有关 Qt 正则表达式类的更多信息。

另请参阅 QRegularExpression .

成员函数文档编制

QRegularExpressionMatch:: QRegularExpressionMatch ()

Constructs a valid, empty QRegularExpressionMatch object. The regular expression is set to a default-constructed one; the match type to QRegularExpression::NoMatch and the match options to QRegularExpression::NoMatchOption .

The object will report no match through the hasMatch () 和 hasPartialMatch () member functions.

该函数在 Qt 5.1 引入。

QRegularExpressionMatch:: QRegularExpressionMatch (const QRegularExpressionMatch & match )

Constructs a match result by copying the result of the given match .

另请参阅 operator= ().

QRegularExpressionMatch:: ~QRegularExpressionMatch ()

销毁匹配结果。

QString QRegularExpressionMatch:: captured ( int nth = 0) const

返回子字符串捕获通过 nth 捕获组。

nth capturing group did not capture a string, or if there is no such capturing group, returns a null QString .

注意: The implicit capturing group number 0 captures the substring matched by the entire pattern.

另请参阅 capturedRef (), capturedView (), lastCapturedIndex (), capturedStart (), capturedEnd (), capturedLength (),和 QString::isNull ().

QString QRegularExpressionMatch:: captured (const QString & name ) const

Returns the substring captured by the capturing group named name .

If the named capturing group name did not capture a string, or if there is no capturing group named name , returns a null QString .

另请参阅 capturedRef (), capturedView (), capturedStart (), capturedEnd (), capturedLength (),和 QString::isNull ().

QString QRegularExpressionMatch:: captured ( QStringView name ) const

Returns the substring captured by the capturing group named name .

If the named capturing group name did not capture a string, or if there is no capturing group named name , returns a null QString .

该函数在 Qt 5.10 引入。

另请参阅 capturedRef (), capturedView (), capturedStart (), capturedEnd (), capturedLength (),和 QString::isNull ().

int QRegularExpressionMatch:: capturedEnd ( int nth = 0) const

Returns the offset inside the subject string immediately after the ending position of the substring captured by the nth capturing group. If the nth capturing group did not capture a string or doesn't exist, returns -1.

另请参阅 capturedStart (), capturedLength (),和 captured ().

int QRegularExpressionMatch:: capturedEnd (const QString & name ) const

Returns the offset inside the subject string immediately after the ending position of the substring captured by the capturing group named name . If the capturing group named name did not capture a string or doesn't exist, returns -1.

另请参阅 capturedStart (), capturedLength (),和 captured ().

int QRegularExpressionMatch:: capturedEnd ( QStringView name ) const

Returns the offset inside the subject string immediately after the ending position of the substring captured by the capturing group named name . If the capturing group named name did not capture a string or doesn't exist, returns -1.

该函数在 Qt 5.10 引入。

另请参阅 capturedStart (), capturedLength (),和 captured ().

int QRegularExpressionMatch:: capturedLength ( int nth = 0) const

Returns the length of the substring captured by the nth 捕获组。

注意: This function returns 0 if the nth capturing group did not capture a string or doesn't exist.

另请参阅 capturedStart (), capturedEnd (),和 captured ().

int QRegularExpressionMatch:: capturedLength (const QString & name ) const

Returns the length of the substring captured by the capturing group named name .

注意: This function returns 0 if the capturing group named name did not capture a string or doesn't exist.

另请参阅 capturedStart (), capturedEnd (),和 captured ().

int QRegularExpressionMatch:: capturedLength ( QStringView name ) const

Returns the length of the substring captured by the capturing group named name .

注意: This function returns 0 if the capturing group named name did not capture a string or doesn't exist.

该函数在 Qt 5.10 引入。

另请参阅 capturedStart (), capturedEnd (),和 captured ().

QStringRef QRegularExpressionMatch:: capturedRef ( int nth = 0) const

Returns a reference to the substring captured by the nth 捕获组。

nth capturing group did not capture a string, or if there is no such capturing group, returns a null QStringRef .

注意: The implicit capturing group number 0 captures the substring matched by the entire pattern.

另请参阅 captured (), capturedView (), lastCapturedIndex (), capturedStart (), capturedEnd (), capturedLength (),和 QStringRef::isNull ().

QStringRef QRegularExpressionMatch:: capturedRef (const QString & name ) const

Returns a reference to the string captured by the capturing group named name .

If the named capturing group name did not capture a string, or if there is no capturing group named name , returns a null QStringRef .

另请参阅 captured (), capturedView (), capturedStart (), capturedEnd (), capturedLength (),和 QStringRef::isNull ().

QStringRef QRegularExpressionMatch:: capturedRef ( QStringView name ) const

Returns a reference to the string captured by the capturing group named name .

If the named capturing group name did not capture a string, or if there is no capturing group named name , returns a null QStringRef .

该函数在 Qt 5.10 引入。

另请参阅 captured (), capturedView (), capturedStart (), capturedEnd (), capturedLength (),和 QStringRef::isNull ().

int QRegularExpressionMatch:: capturedStart ( int nth = 0) const

Returns the offset inside the subject string corresponding to the starting position of the substring captured by the nth capturing group. If the nth capturing group did not capture a string or doesn't exist, returns -1.

另请参阅 capturedEnd (), capturedLength (),和 captured ().

int QRegularExpressionMatch:: capturedStart (const QString & name ) const

Returns the offset inside the subject string corresponding to the starting position of the substring captured by the capturing group named name . If the capturing group named name did not capture a string or doesn't exist, returns -1.

另请参阅 capturedEnd (), capturedLength (),和 captured ().

int QRegularExpressionMatch:: capturedStart ( QStringView name ) const

Returns the offset inside the subject string corresponding to the starting position of the substring captured by the capturing group named name . If the capturing group named name did not capture a string or doesn't exist, returns -1.

该函数在 Qt 5.10 引入。

另请参阅 capturedEnd (), capturedLength (),和 captured ().

QStringList QRegularExpressionMatch:: capturedTexts () const

Returns a list of all strings captured by capturing groups, in the order the groups themselves appear in the pattern string. The list includes the implicit capturing group number 0, capturing the substring matched by the entire pattern.

QStringView QRegularExpressionMatch:: capturedView ( int nth = 0) const

Returns a view of the substring captured by the nth 捕获组。

nth capturing group did not capture a string, or if there is no such capturing group, returns a null QStringView .

注意: The implicit capturing group number 0 captures the substring matched by the entire pattern.

该函数在 Qt 5.10 引入。

另请参阅 captured (), capturedRef (), lastCapturedIndex (), capturedStart (), capturedEnd (), capturedLength (),和 QStringView::isNull ().

QStringView QRegularExpressionMatch:: capturedView ( QStringView name ) const

Returns a view of the string captured by the capturing group named name .

If the named capturing group name did not capture a string, or if there is no capturing group named name , returns a null QStringView .

该函数在 Qt 5.10 引入。

另请参阅 captured (), capturedRef (), capturedStart (), capturedEnd (), capturedLength (),和 QStringRef::isNull ().

bool QRegularExpressionMatch:: hasMatch () const

返回 true if the regular expression matched against the subject string, or false otherwise.

另请参阅 QRegularExpression::match () 和 hasPartialMatch ().

bool QRegularExpressionMatch:: hasPartialMatch () const

返回 true if the regular expression partially matched against the subject string, or false otherwise.

注意: Only a match that explicitly used the one of the partial match types can yield a partial match. Still, if such a match succeeds totally, this function will return false, while hasMatch () will return true.

另请参阅 QRegularExpression::match (), QRegularExpression::MatchType ,和 hasMatch ().

bool QRegularExpressionMatch:: isValid () const

返回 true if the match object was obtained as a result from the QRegularExpression::match () function invoked on a valid QRegularExpression 对象;返回 false QRegularExpression was invalid.

另请参阅 QRegularExpression::match () 和 QRegularExpression::isValid ().

int QRegularExpressionMatch:: lastCapturedIndex () const

Returns the index of the last capturing group that captured something, including the implicit capturing group 0. This can be used to extract all the substrings that were captured:

QRegularExpressionMatch match = re.match(string);
for (int i = 0; i <= match.lastCapturedIndex(); ++i) {
    QString captured = match.captured(i);
    // ...
}
					

Note that some of the capturing groups with an index less than lastCapturedIndex() could have not matched, and therefore captured nothing.

If the regular expression did not match, this function returns -1.

另请参阅 captured (), capturedStart (), capturedEnd (),和 capturedLength ().

QRegularExpression::MatchOptions QRegularExpressionMatch:: matchOptions () const

Returns the match options that were used to get this QRegularExpressionMatch object, that is, the match options that were passed to QRegularExpression::match () 或 QRegularExpression::globalMatch ().

另请参阅 QRegularExpression::match (), regularExpression (),和 matchType ().

QRegularExpression::MatchType QRegularExpressionMatch:: matchType () const

Returns the match type that was used to get this QRegularExpressionMatch object, that is, the match type that was passed to QRegularExpression::match () 或 QRegularExpression::globalMatch ().

另请参阅 QRegularExpression::match (), regularExpression (),和 matchOptions ().

QRegularExpression QRegularExpressionMatch:: regularExpression () const

返回 QRegularExpression object whose match() function returned this object.

另请参阅 QRegularExpression::match (), matchType (),和 matchOptions ().

void QRegularExpressionMatch:: swap ( QRegularExpressionMatch & other )

Swaps the match result other with this match result. This operation is very fast and never fails.

QRegularExpressionMatch &QRegularExpressionMatch:: operator= (const QRegularExpressionMatch & match )

Assigns the match result match to this object, and returns a reference to the copy.

QRegularExpressionMatch &QRegularExpressionMatch:: operator= ( QRegularExpressionMatch && match )

Move-assigns the match result match to this object, and returns a reference to the copy.

相关非成员

QDebug operator<< ( QDebug debug , const QRegularExpressionMatch & match )

Writes the match object match 到 debug 对象 debug 为调试目的。

另请参阅 调试技术 .