Finding URL & Email text in a string?

[eluser]dejan[/eluser]
Do you need to extract an email and/or URL from a string, or check if a string is valid email/url?

If latter, it's easy:

filter_var($string, FILTER_VALIDATE_EMAIL);
filter_var($string, FILTER_VALIDATE_URL);

If former, it's a bit trickier. You can either try with regex, which I suggest you google for, or you can tokenize the string and check each token, like so:

foreach (preg_split('/\b/', $string) as $token) {
if (filter_var($token, FILTER_VALIDATE_EMAIL)) return $token;
}

\b in regex is word boundry (space, comma, dot, semicolon, etc.).