QRegExp Global Flag
Is there any way to set the
globalflag for a regular expression using
Matching against the following:
(((119.7500182 25.3, 119.7730556 25.3, 119.7730556 25.3833333, 119.9672222 25.3833333, 119.9672222 25.1583333, 119.6125 25.1583333, 119.6125 25.3, 119.7500182 25.3)), ((119.8672912 25.8163889, 119.9672222 25.8163889, 119.9672222 25.6916667, 119.8561111 25.6916667, 119.8561111 25.8163889, 119.8672912 25.8163889)), ((119.4675 25.6008704, 119.4675 25.8163889, 119.5633333 25.8163889, 119.5633333 25.65, 119.5833333 25.65, 119.5833333 25.4805556, 119.6033333 25.4805556, 119.6033333 25.4316667, 119.4675 25.4316667, 119.4675 25.6008704)))
Should produce 3 capture groups (well, when testing on various online RegEx processors) however Qt only manages 1 capture group.
globalflag on the various online processors replicates the same behaviour as Qt.
JonB last edited by JonB
Various ways, e.g. http://doc.qt.io/qt-5/qregexp.html#cap, http://doc.qt.io/qt-5/qregexp.html#capturedTexts. You don't specify "global", you get the captures anyway. So what makes you say "Should produce 3 capture groups [but does not]"?
Also (since someone else will doubtless say this to you):
Note: In Qt 5, the new QRegularExpression class provides a Perl compatible implementation of regular expressions and is recommended in place of QRegExp.
@JonB Unfortunately, I'm not getting the captures - well, not all 3 as I expect.
The reason I expect them is that when testing using the online tools (using various RegEx "flavours"), I get 3 captures. Here's a link showing just that:
If I then try the same pattern and text in the
regexpQt example project, I only get 1 capture.
JonB last edited by
I don't know what the code of "regexp Qt example project" does, one way or the other. You'd have to look at it to see what it's doing & reporting.
However, can't you change over the recommended
QRegularExpressionclass I mentioned? Since that states it's Perl-compatible, you'll know its behaviour is as per when you have looked at Perl flavor regular expressions.
@JonB I'll move my code over to the
QRegularExpressionclass as you've mentioned.
JonB last edited by
It's probably the best idea anyway. Then hopefully you will see your pattern work exactly as per Perl, which you've probably checked in your regular expression tester as doing what you want.
@JonB Works like a treat, thanks for your help. I shall no longer use
QRegExp. Thanks again