preg replace help

[FiRe]

I want to strip out the following in a string:

[blah.com...]

Basically the URL followed by 4 0-9A-Za-z

I have this:

preg_replace('/http:\/\/blah\.com\/[0-9A-Za-z]{4}/', '', $text);

But it doesn't quite work. I still want it to show URL's like [blah.com...] and [blah.com...]

Any ideas?

[FiRe]

I actually want to extract the 'aBc4' first, store it in a variable, and then remove it from the string

[NomikOS]

idea:

if (preg_match('/(http:\/\/[^\/]+)\/([0-9A-Za-z]{4})/', $text, $match)) 
{ 
  $url = $match[1]; 
  $extract = $match[2]; 
} 
else 
{ 
  $url = $text; 
}