RegEx : Grab domain after sub domain (if there is one) from URL

Question

This is my problem: http://regexr.com?2temn

I'm sure it's pretty simple for some of you regex masters.

Cheers!

Please post the problem here instead of linking it to an external page that might be gone soon. People without Flash players (iOS, anyone?), can't see the problem at all. And even if I turn off my Flash blocker and see the site, I still don't understand what exactly you're trying to do. — Tim Pietzcker, Apr 01 '11 at 14:50
you should rephrase your question. links to an external sites are fine but the question must be comprehensive also without this additional info. Also name where you're using this regex. There are many flavors of regex... — bw_üezi, Apr 01 '11 at 14:54
@Christopher: Because all the annoying ads are Flash ads. There is not much useful Flash content around IMO. Regexr being an exception, of course. — Tim Pietzcker, Apr 01 '11 at 15:56

score 3 · Accepted Answer · answered Apr 01 '11 at 15:17

3

This also works:

(?<=\.|)\w+\.\w+$

Tested only with PHP.

answered Apr 01 '11 at 15:17

Kit

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can you latch domain with "-" inside ? – Stephan Apr 01 '11 at 15:22
Works only for `http://www.example.com` or `http://sub1.sub2.example.com` etc but fails if there's trailing / or path in the URL. – Kev Apr 01 '11 at 15:29

score 2 · Answer 2 · edited May 23 '17 at 12:09

2

Grab domain after (possible) sub domain
is in fact the same as
grab domain before top level domain

it's just get the domain name from a URL.

possible duplicate

edited May 23 '17 at 12:09

Community

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answered Apr 01 '11 at 15:06

bw_üezi

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Stephan · Answer 3 · 2017-11-01T19:38:22.793

1

Regex (generic form) :
/^(?:https?://)?(?:([\w_.-]+?).)*[\w_-]+\.\w+.+$/i

Test :

http://subdomain.domain.tld/foo/bar.html      => One match    (subdomain)
http://subdomain.subdomain2.domain.tld/bar    => Two submatches (subdomain, subdomain2)
http://justdomain.tld                         => NO match

Tested with C#.
C# version of the regex :

 ^(?:http://)?(?:([\w+_.-]+?)\.)*[\w+_-]+\.\w+.+$

DEMO

edited Nov 01 '17 at 19:38

answered Apr 01 '11 at 14:53

Stephan

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This would not match https sites. – TheDude Apr 01 '11 at 14:58
I have just added it the support for https sites. But what about other protocols (ftp, irc etc) ? pagewil didn't precize. – Stephan Apr 01 '11 at 15:07
This does not work if the tld is of two words. Like something.co.uk – Kannaiyan Nov 01 '17 at 17:50
@Kannaiyan Please see the working demo in the post with `.co.uk` domains. – Stephan Nov 01 '17 at 19:39

score 1 · Answer 4 · answered Apr 01 '11 at 14:56

1

Try with:

(\w+\.\w+)[\r\n]+

It matches string with dot inside before new line character

answered Apr 01 '11 at 14:56

hsz

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score 0 · Answer 5 · answered Aug 23 '22 at 06:43

0

I adjusted your version slightly:

(?:\.|)\w+(\.\w+){1,}

I just made the trailing ".xyz" part be a separate token to loop one or many times ("{1,}").

answered Aug 23 '22 at 06:43

Ryan Briscall

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RegEx : Grab domain after sub domain (if there is one) from URL

5 Answers5