PHP Regexp Non capturing group not working

Question

I'm trying to get the domain and tld from an http_host by using the following regexp:

(?:^|\.)(.+?\.(?:it|com))

The regexp works correctly in gskinner.com.

Input:

domain.com
www.domain.com

Captured groups in both:

domain.com

However in php the following:

preg_match("/(?:^|\.)(.+?\.(?:it|com))/", "www.domain.com", $matches);
print_r($matches);

Output:

Array
(
    [0] => www.baloodealer.com
    [1] => www.baloodealer.com
)

What's wrong with this?

I'm curious about how you can get "www.baloodealer.com" out of "www.domain.com" — CrayonViolent, Nov 08 '13 at 21:17
see this: http://stackoverflow.com/questions/2679618/get-domain-name-not-subdomain-in-php — anubhava, Nov 08 '13 at 21:23
@anubhava Thanks! But actually the question was more about the regex part than the php one. — Damiano Barbati, Nov 08 '13 at 22:00

score 1 · Answer 1 · answered Nov 08 '13 at 21:21

1

You can do this:

preg_match("/[^.]+\.(?:it|com)$/", "www.domain.com", $matches);
print_r($matches);

/* output
Array
(
    [0] => domain.com
)
*/

answered Nov 08 '13 at 21:21

CrayonViolent

I'm giving this to pob because he answered first. But thanks anyway Crayon!! I always use the dot to be faster but it is do darn evil. – Damiano Barbati Nov 08 '13 at 22:03
@DamianoBarbati okay well, pob's regex is flawed. run pob's regex against `www.company.com` and see what happens. – CrayonViolent Nov 08 '13 at 22:05

pobrelkey · Accepted Answer · 2013-11-08T23:02:25.567

0

I presume you want the last two parts of the domain? Before the TLD, don't match just any character:

"/(?:^|\.)([^\.]+?\.(?:it|com))$/"

(EDIT: anchoring to the end of the string, to fix bug pointed out in comment.)

edited Nov 08 '13 at 23:02

answered Nov 08 '13 at 21:19

pobrelkey

This will return "www.com" on "www.company.com" – CrayonViolent Nov 08 '13 at 22:06
@CrayonViolent: D'oh. Thanks for pointing that out - should be fixed now. – pobrelkey Nov 08 '13 at 23:07

2 Answers2