PHP: Regular Expression to get a URL from a string [duplicate]

Answer 1

Why not try this one. It is the first result of Googling "URL regular expression".

((https?|ftp|gopher|telnet|file|notes|ms-help):((\/\/)|(\\\\))+[\w\d:#@%\/;$()~_?\+-=\\\.&]*)

Not PHP, but it should work, I just slightly modified it by escaping forward slashes.

source

Answer 2

Jan Goyvaerts, Regex Guru, has addressed this issue in his blog. There are quite a few caveats, for example extracting URLs inside parentheses correctly. What you need exactly depends on the "quality" of your input data.

For the examples you provided, \b(?:(?:https?|ftp|file)://|www\.|ftp\.)[-A-Z0-9+&@#/%=~_|$?!:,.]*[A-Z0-9+&@#/%=~_|$] works when used in case-insensitive mode.

So to find all matches in a multiline string, use

preg_match_all('/\b(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)[-A-Z0-9+&@#\/%=~_|$?!:,.]*[A-Z0-9+&@#\/%=~_|$]/i', $subject, $result, PREG_PATTERN_ORDER);
$result = $result[0];