Regex for URL C#

Question

In my C# program I wrote a Google Search Function, which works by fetching the source from each page and getting the URLs via regex.

My actual Regex is:

(?:(?:(?:http)://)(?:w{3}\\.)?(?:[a-zA-Z0-9/;\\?&=:\\-_\\$\\+!\\*'\\(\\|\\\\~\\[\\]#%\\.])+)

This works good at the moment, but I get for example URLs like http://www.example.com/forums/arcade.php?efdf=332

I just want to get in this case the URL without the ?efdf=332 at the end.

So how should I change the regex?

Hi Omegavirus, welcome to Stack Overflow. I've noticed that you went to a lot of trouble to get your regex formatted correctly, but you could have had it a lot easier. Just paste the original regex, mark it and press Ctrl-K. This will format the text as verbatim text (like HTML pre tag). Much less potential for errors. — Tim Pietzcker
– Tim Pietzcker, Commented Nov 21, 2010 at 14:09
oh i didn't know that, thanks ;) and the regex is from my c# program so \ are escaped. forgot to say that. — Omegavirus
– Omegavirus, Commented Nov 21, 2010 at 14:10
In C#, use verbatim strings (@"foo") with regexes. Then you don't have to escape your backslashes. You'll go crazy otherwise. Regexes are hard enough to read already... — Tim Pietzcker
– Tim Pietzcker, Commented Nov 21, 2010 at 14:15

Tim Pietzcker · Accepted Answer · 2010-11-21 14:14:26Z

2

http://(?:www\.)?[a-zA-Z0-9/;&=:_$+!*'()|~\[\]#%.\\-]+

does the same as your regex (I've removed a lot of unnecessary cruft) but stops matching a link before a ?.

In C#:

Regex regexObj = new Regex(@"http://(?:www\.)?[a-zA-Z0-9/;&=:_$+!*'()|~\[\]#%.\\-]+")

That said, I'm not sure this is such a good way of matching URLs (what about https, ftp, mailto etc.?)

answered Nov 21, 2010 at 14:14

Tim Pietzcker

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3 Comments

Omegavirus Over a year ago

many thanks ;) https etc is no problem cause i won't need them.. http is all :) just tested your regex and its nearly working. but now i get urls like blabla.com/forums/&ampblabla how to filter these also out?

Tim Pietzcker Over a year ago

So you just want domain + path without any parameters?

Tim Pietzcker Over a year ago

Try removing the & from the regex. Same with any other characters you don't want to allow.

svick · Accepted Answer · 2010-11-21 14:15:40Z

0

You can use the Uri class to access various parts of the URL and either remove the query string from the end, or concatenate the parts you want.

answered Nov 21, 2010 at 14:15

svick

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