Match a URL

egrep 'https?://([[:alpha:]]([-[:alnum:]]+[[:alnum:]])*\.)+[[:alpha:]]{2,3}(:\d+)?(/([-\w/_\.]*(\?\S+)?)?)?'
For the record: I didn't build this. Just shared what I found that worked. Apologies to the original author! I decided I should fix the case where http://example.com is not matched for the next time I need this. So I read rfc1035 and formalized the host name regex. If anyone finds any more holes, please comment.

5
2009-11-28 15:41:42

2 Alternatives + Submit Alt

What Others Think

only matches domains starting with www but still nice
tcfusion · 442 weeks ago
It should now match http://example.com if you like to give it another try. Good catch BTW!
putnamhill · 441 weeks ago
http://foo.com./blah_blah should match too. Mind the last dot in the domain so I added \.? there too + it does not work for .aero, .arpa, .asia, .coop, .info, .jobs, .mobi, .museum, .name and .travel so I extended from 3 to 6 egrep 'https?://([[:alpha:]]([-[:alnum:]]+[[:alnum:]])*\.)+[[:alpha:]]{2,6}(:\d+)?\.?(/([-\w/_\.]*(\?\S+)?)?)?' Cheers
bw · 438 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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