I want to extract all table rows from an HTML page.
But using the pattern @"<tr>([\w\W]*)</tr>" is not working.
It's giving one result which is first occurence of <tr> to last occurrence of </tr>.
But I want every occurrence of <tr>...</tr> value.
Can anyone please tell me how I can do this?
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2 Answers
[\w\W]* matches greedily so it will match from the first <tr> to the last </tr>.
A regex approach won't work well because HTML is not a regular language. If you really wanted to try to use a lazy modifier such as "<tr>(.*?)</tr>" with the RegexOptions.Singleline flag, however this isn't guaranteed to work in all cases.
For parsing HTML you need an HTML parser. Try HTML Agility Pack.
3 Comments
Zach Johnson
And we all know what happens when you try to parse html with a regex... stackoverflow.com/questions/1732348/…
Barun
Another question is there anyway so that I can do it using regex ?
Mark Byers
This page shows a quick example of how the HTML Agility Pack library can be used: htmlagilitypack.codeplex.com/wikipage?title=Examples
I do agree with Mark: you should to use HTML Agility Pack library.
About your regex, you should to go with something like:
@"<tr>([\s\S]*?)</tr>"
That's a non greedy pattern, and you should to get one match for every TR.
1 Comment
Barun
Another question... Can you provide me any link or book name where I can learn this all regex [C#] property properly ?