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Regular expression (regexp) matching with back-references.
This was implemented because QRegExp does not support back-references.
Back-references are parts of a regexp grouped with parentheses. If a string matches the regexp, you can access the text that matched each group with the group method. This is similar to regular expressions in Perl.
Example:
KRegExp ex( "([A-Za-z]+) (.+)" ); ex.match( "42 Torben Weis" ); qDebug( ex.group(0) ); qDebug( ex.group(1) ); qDebug( ex.group(2) );
Output:
Torben Weis Torben Weis
Please notice that KRegExp does @bf not support unicode.
KRegExp () |
Create a KRegExp object without a default pattern.
KRegExp ( const char *_pattern, const char *_mode = "" ) |
Create a KRegExp object.
Parameters:
_pattern | The regular expression to use for matches. |
_mode | If this is "i", case-insensitive matches will be performed. |
bool compile ( const char *_pattern, const char *_mode = "" ) |
Prepare a regular expression for subsequent matches.
Parameters:
_pattern | The regular expression to use for matches. |
_mode | If this is "i", case-insensitive matches will be performed. |
bool match ( const char *_string ) |
Match a string to the last supplied regexp.
Returns: true
on match, false otherwise.
const char * group ( int _grp ) |
Parameters:
_grp | May be in the range [0..9]. If _grp is 0 then the complete
matched string is returned.
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Returns: a grouped substring. A substring may be empty. In this case 0 is returned. Otherwise you may @bf not delete or modify the returned value. In addition the returned value becomes invalid after the KRegExp instance is deleted or after @ref @match() was called again.
int groupStart ( int _grp ) |
Parameters:
_grp | May be in the range [0..9]. If _grp is 0 then the start offset
of the complete matched string is returned.
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Returns: The start offset of the grouped substring.
int groupEnd ( int _grp ) |
Parameters:
_grp | May be in the range [0..9]. If _grp is 0 then the end offset
of the complete matched string is returned.
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Returns: The end offset of the grouped substring. The "end offset" is the first character after the string.