QRegularExpression need help with patern
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Hello all,
I just can't get it right.. maybe someone can help me with it?
I have QByteArray with list of elements in it and looks like that:
@
<!--story_23015_start--> test test 234 2tsdtsdf sf sdfds <!--story_23015_end-->
......
<!--story_2301275_start--> tsdtsdf sf sdfds <!--story_2301275_end-->
@how can I extract numbers between "<!--story_" & "_start-->" and text in the midle from each item using QRegularExpression?
I will really appreciate your help!
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Thank you very much mcosta
The problem is: items are not one per line and they can have text or any chars at the beginning or at the end. Like:
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asdmpowq d34 23 <!--story_23015_start--> test test 234 2tsdtsdf sf sdfds <!--story_23015_end--> html tags etc
<!--story_2301275_start--> tsdtsdf sf sdfds <!--story_2301275_end-->
@I have tried this way, but I just whole items as one item and not the list.
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QRegExp rx("(.+)<!--story_(\d+)_start-->(.+)<!--story.+-->(.+)");
int pos = 0;
while((pos = rx.indexIn(data,pos)) != -1)
{
qDebug() << rx.cap(2) << pos;
pos += rx.matchedLength();
}
@ -
Hi,
You can use an expression as follow:
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<!--story_(\d+)start-->(.+)(?=<!--story(\d+)_end-->)
@But I am not sure that the positive lookahead (?=) works on QRegExp, it should work according to the docs.
According to the docs the .(dot) should match newlines.
Hint: I normally use the following website to test my regular expressions, it works quite well: http://www.regexr.com/
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Another interesting option is (sorry just escape for usage):
@
<!--story_(\d+)start-->([\s\S]+)<!--story(\1)_end-->
@This can be used to make sure that the story number matches in the start and end using a "backreference":http://qt-project.org/doc/qt-4.8/qregexp.html#backreferences to the number captured in the start.
The [\s\S] is used if the .(dot) does not match a new line.
If you don't want to capture the number in the end tag you can use the (?:\1) tag to make a non-capturing group for that number.
Hope this helps a bit
