Detecting a url using preg_match? without http:// in the string

Question

I was wondering how I could check a string broken into an array against a preg_match to see if it started with www. I already have one that check for http://www.

Answer 1

John Gruber of Daring Fireball has posted a very comprehensive regex for all types of URLs that may be of interest. You can find it here:

http://daringfireball.net/2010/07/improved_regex_for_matching_urls