[Qt-interest] Some characters breaking QRegExp

[Atlant Schmidt]

Paul:

  Interestingly enough, your example works, *AS WRITTEN*, in Perl.

  Here's the output from my test:

temp > perl test.pl
Result = "Rhythm Game"
Result = "Darkside Digital Records"
Result = "Wally Lopez, Ismael Rivas (aka Riva), Marshall (aka Luigi Rocca)"
Result = "Eric Volta's Bust That Remix"

  Included below is the Perl code I executed. Note (for the skeptics?) that I've
  escaped the apostrophe only so that it doesn't end the Perl single-quoted
  initializer strings; the escaping doesn't survive into the actual string data.

  'Looks to me like you either found a bug or a limitation in the Qt regexp
  implementation.

                                    Atlant

 -=-=-=-=-=-

temp > cat test.pl
@test =
  (

    '<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Rhythm Game<!--/defang_font--></span></td>',

    '<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Darkside Digital Records<!--/defang_font--></span></td>',

  '<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Wally Lopez, Ismael Rivas (aka Riva), Marshall (aka Luigi Rocca)<!--/defang_font--></span></td>',


  '<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Eric Volta\'s Bust That Remix<!--/defang_font--></span></td>'

  );

foreach $string (@test)
  {
#   print "\"$string\"\n";
    $string =~ m/.*font-family:.+\">(.+)<!.*/o;
    print "Result = \"$1\"\n";
#   print "\n";
  }

________________________________
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Paul England
Sent: Wednesday, October 20, 2010 04:35
To: qt-interest at trolltech.com
Subject: [Qt-interest] Some characters breaking QRegExp

Hi.

I think I have some characters which are breaking my QRegExp.

It's a simple one to read specific tags out of a webpage.

QRegExp rx_val(  ".*font-family:.+\">(.+)<!.*" );

     while ( !page.atEnd() ) {
        if ( rx_val.indexIn( line ) != -1 ) {
               // parse;
        }
    }

Here are some examples that work:


<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Rhythm Game<!--/defang_font--></span></td>

<td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Darkside Digital Records<!--/defang_font--></span></td>



These two do not.  The only difference is the apostrophe in one, and the parenthesis in the others.



  <td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Wally Lopez, Ismael Rivas (aka Riva), Marshall (aka Luigi Rocca)<!--/defang_font--></span></td>

  <td style="margin: 2px; padding: 1px; border: 0px solid; "><!--defang_font size="1" face="Verdana" style--><span style="font-size: x-small; font-family: Verdana; ">Eric Volta's Bust That Remix<!--/defang_font--></span></td>





I've never heard of the string being searched having have characters escaped.



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