Extract text with C# and RegExp

[Alberto Sartori]

Hello,
I have a html text with custom tags which looks like html comment,
such:

"text text text <p>text</p> text test test
text text text <p>text</p> text test test
<!-- @MyTag@ -->extract this<!-- /@MyTag@ -->
text text text <p>text</p> text test test
<!-- @MyTag@ -->and this<!-- /@MyTag@ -->
text text text <p>text</p> text test test"

My regexp should extract the first part of text till first opening tag
(<!-- @MyTag@ -->), then the text between tags (extract this, and
this). I had headache by finding the right pattern. Any help? thanks!

Alberto

 

[Jesse Houwing]

* Alberto Sartori wrote, On 18-7-2007 15:10:

Hello,
I have a html text with custom tags which looks like html comment,
such:

"text text text <p>text</p> text test test
text text text <p>text</p> text test test
<!-- @MyTag@ -->extract this<!-- /@MyTag@ -->
text text text <p>text</p> text test test
<!-- @MyTag@ -->and this<!-- /@MyTag@ -->
text text text <p>text</p> text test test"

My regexp should extract the first part of text till first opening tag
(<!-- @MyTag@ -->), then the text between tags (extract this, and
this). I had headache by finding the right pattern. Any help? thanks!

Alberto

<!-- @(?<tagname>\w+)@ -->(?<content>.*?)<!-- /@\k<tagname>@ -->

should do the trick.

<!-- @ looks for the beginning of a tag
(?<tagname>\w+) looks for the name of the tag and captures it
@ --> end of the opening tag

(?<content>.*?) Capture the contents of the tag

<!-- /@ looks for the beginning of an end tag
\k<tagname> ensures it's the same tagname as the one before
@ --> end of the end tag

The tagname is captured in a group named 'tagname' and the content of
the tag in a group named 'content'.

Once you've gotten a match in your text you can reference the contents
like this:

Match m = Regex.Match(...);
if (m.Success)
{
string tagname = m.Groups["tagname"].Value;
string content = m.Groups["content"].Value;
}


Kind regards,

Jesse