Extract URL from string

Question

I\'m trying to find a reliable solution to extract a url from a string of characters. I have a site where users answer questions and in the source box, where they enter thei

Answer 1

$string = preg_replace('/https?:\/\/[^\s"<>]+/', '$0', $string);

It only matches http/https, but that's really the only protocol you want to turn into a link. If you want others, you can change it like this:

$string = preg_replace('/(https?|ssh|ftp):\/\/[^\s"]+/', '$0', $string);