[Interest] Extract a line using a QRegularExpression

[Nye]

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 <kshegunov at gmail.com>
> *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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>>
>>
>
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