4 replies to this topic

[c1neast]

I need to extract a string from another string using regex, and dont come with no substrings cause the solution has to work for different amounts of letters in the string.
This is my string (for example):
-sv"><a href="http://sv.wikipedia.org/wiki/%C3%84pple" title="
now the length of this part of the string and also the rest of the string may vary.
What I want to extract is the link between the quotation marks. I've tried to make a regex but I couldn't make the quotation marks work within the quote, this is what it looks like (I have no idea of what I did there...):

           Regex linkRegex = new Regex(@"sv""><a href=""\s*(?sv""><a href=""[^<]+)\s*"" title""", System.Text.RegularExpressions.RegexOptions.Compiled);


                

            if ( linkRegex.IsMatch(k) ) 

                {

                Match match = linkRegex.Match(k);

                string theLink = match.Groups["link"].Value;

                x = theLink;

                }

Point is: it doesn't work, and I don't see it work anytime soon without anyone who knows this black magic helping me.
Thanks in advance :)

[WingedPanther]

You'll probably have to escape the quotation marks with something like \"

Also, you need to be aware of the language you're doing this in, as Perl RegEx is slightly different from JavaScript RegEx, is slight different from Java RegEx, is slightly different from ...

[c1neast]

well what I've done so far is more or less a copy-paste, so I would really need someone to write a fitting regex for me since I don't understand it at all.
I'm using C#.
EDIT: I also tried to escape the quotations but it simply doesn't work, and that may be the problem itself.

[Alexander]

The following pattern will extract the HREF attribute, assuming you set IgnoreCase and IgnorePatternWhitespace it will work:

@"]*?HREF\s*=\s*[""']?([^'"" >]+?)[ '""]?[^>]*?>";

[c1neast]

Well, it is crucial that I get the sv-part before the href, or it might pick one of the other 500 links with the same surrounding letters. :/