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Need a RegEx (for ASP.NET) which detects a web URL

I need a RegEx that can pick up that a string is a valid web URL.

There must be many. Has anyone for a decent one? And can you show me how to pop it into my C# code and perform the test?

Thanks.

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yeelokhk

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chandrasekar1

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Member_2_4913559

You might find this page (link to your answer as well) a good resource for the future:

http://regexlib.com/REDetails.aspx?regexp_id=1121

curiouswebster

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This one is close but no cigar.

return Regex.IsMatch(url, @"(http|https)://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?");

I modified it to not require "http:" or "https:" and maybe I broke it.

return Regex.IsMatch(url, @"(http|https)://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?") ||
Regex.IsMatch(url, @"([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?");

Then this URL passes but it should fail:
~/Content/images/PHOTO1.jpg

Any ideas?

yeelokhk

You have to convert a relative url to absolutive url.
Try to use Page.ResolveUrl("~/Content/images/PHOTO1.jpg") before you validate it.

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kaufmed

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curiouswebster

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Thanks!