[Interest] Extract a line using a QRegularExpression

[david.carmona93 at gmail.com]

Ok, thank you so much Konstantin for the hint, I will check that. It’s going to be very helpful.


Regards and thank you again

David






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De : Nye
Envoyé : ‎lundi‎ ‎28‎ ‎décembre‎ ‎2015 ‎00‎:‎43
À : david.carmona93 at gmail.com
Cc : interest at qt-project.org





Hello David,
No problem. QRegularExpression is PCRE (perl-compatible reg ex) so you could use https://regex101.com with (php-pcre on the left) to check your patterns against a sample string, and even you get an explanation on the right what is done/matched. Not everything (as syntax) is supported in Qt, but most of the things are available.

Kind regards,
Konstantin.



On Mon, Dec 28, 2015 at 1:34 AM, <david.carmona93 at gmail.com> wrote:




Hi Nye,




In fact, my regular expression was wrong. Yours works like a charm. I appreciate your help. Thank you so much 😊




Regards

David






Envoyé depuis Windows Mail





De : Nye
Envoyé : ‎lundi‎ ‎28‎ ‎décembre‎ ‎2015 ‎00‎:‎23
À : david.carmona93 at gmail.com
Cc : interest at qt-project.org







Hello,
Your regular expression is very strange. You have a character class with two symbols and then you don't have a capture group? Maybe try this: "(?<=\\s)c:\\s?(.*)$"

Kind regards.



On Mon, Dec 28, 2015 at 12:42 AM, <david.carmona93 at gmail.com> wrote:




I am currently trying to extract the following chain of character:




This is a rectangle. Its height is 193, its width is 193 and the word number is 12.




from the following line:




ID: 1 x: 1232 y: 2208 w: 193 h: 390 wn: 12 ln: 13 c: This is a rectangle. Its height is 193, its width is 193 and the word number is 12 !




I have to do this using QRegularExpressions. Therefore, my code is as following:





    regularExpression.setPattern("[c:](?:\\s*)$");
    QRegularExpressionMatch match = regularExpression.match("ID: 2 x: 845 y: 1633 w: 422 h: 491 wn: 78 ln: 12 c: qsdfgh");
    if (match.hasMatch()) {
        QString id = match.captured(0);
        qDebug()<<"The annotation is:"<<id;
        return id;
    }
    return 0;





However, it does not work at all and I do not understand why (maybe my regular expression is not correct).I am stuck in this problem from several days now.




Could you help me please ?




Best regards

David






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