Regular expression to find URLs within a string

Question

Does anyone know of a regular expression I could use to find URLs within a string? I\'ve found a lot of regular expressions on Google for determining if an entire string is

Answer 1

This is a simplest one. which work for me fine.

%(http|ftp|https|www)(://|\.)[A-Za-z0-9-_\.]*(\.)[a-z]*%