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I am using a regular expression for validation web url. that is not validating more than one dots(.) like www.gmail.....com, other than this it is working fine.can any body update my regular expression-

^[a-zA-Z0-9\-\.]+\.(com|org|net|mil|edu|COM|ORG|NET|MIL|EDU)$
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    Which language/regex facility? Commented Dec 13, 2010 at 11:50
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    You should change web url to domain name Commented Dec 13, 2010 at 11:51
  • URL's can contain a lot of characters. Not only a-z. Characters like ü could appear, too. And you should match case-insensitive instead of using com|COM (think about cOM or Com, which are valid, too). Commented Dec 13, 2010 at 11:52
  • Your top-level domain part needs to account for the many country codes (.uk, .es, .us, .ca, .au and the 200-odd others) as well as other TLDs like .info, .tv, .museum... there are loads! You'd be best just using [a-z]{2,6} (as far as I know, no TLDs use numbers or other characters). Commented Dec 13, 2010 at 12:07
  • @Nathan, there are a number of internationalized TLDs which include non-alpha characters: en.wikipedia.org/wiki/… Commented Dec 14, 2010 at 5:51

3 Answers 3

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UPDATE. Note this is not foolproof by any means.

^([a-zA-Z0-9\-]+\.)+(com|org|net|mil|edu|COM|ORG|NET|MIL|EDU)$

The + tells the regex to match one or more times

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4 Comments

This doesn't take into account country codes, and the many other top-level domains.
I'm modifying the OPs regex to meet their stated requirements.
You are almost on to something. The first \. doesn't belong.
@Marcelo True, hadn't spotted that. It shouldn't have been there in the first place :)
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For Perl-compatible regex syntax, you can do this:

^([a-zA-Z0-9-]|\.(?!\.))+\.(com|...

Also, this is very US-centric. My company's domain ends in .com.au.

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Why don't you use +? [\.]+ could be matched with one more .!

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