Question

Hey guys. Right now I have this regex on my PHP app:

$regex = '#^(www\.)*([^www][a-z0-9-]+)\.tanlup\.local$#';

Here is what I need it to do:

MATCH www.something.tanlup.local  
MATCH something.tanlup.local

NOT MATCH www.tanlup.local  
NOT MATCH tanlup.local

The problem is that when I have a subdomain starting with a “w”, it doesn’t match! Does anyone knows why and how could I make it better?

Thanks!

Answer 1

Building overly complex regular expressions for one-off situations like this is self-defeating. You might have better luck building a very generic regular expression and black listing certain domains:

$regex = '/^([-\w]+.)+tanlup.local$/';
$disallowed = array ('www.tanlup.local', 'tanlup.local');

if (preg_match($regex, $str) && false === array_search($str, $disallowed) {
  // success
}