match url pattern in php using regular expression

Question

I want to match a url link in wall post and replace this link with anchor tag, for this I use the regular expression below.

I would like the match 4 types of url:

Answer 1

My two cents (five years later!):

preg_match("/^((https|http|ftp)\:\/\/)?([a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-zA-Z]{2,4}|[a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-zA-Z]{2,4}|[a-z0-9A-Z]+\.[a-zA-Z]{2,4})$/i", $url)

Answer 2

I'd use a different regex to be honest. Like this one that Gruber posted in 2009:

\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))

or this updated version that Gruber posted in 2010 (thanks, @IMSoP):

(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))