Question

I have an PHP array of strings it looks like this

Array
(
    [1] => Lorem ipsum dolor sit amet http://www.google.com/search?q=stackoverflow consectetur adipiscing elit.
    [2] => Phasellus tempor vehicula fringilla. www.google.com/search?q=stackoverflow&ie=utf-8
    [3] => google.com/search?q=stackoverflow&ie=utf-8 Aenean in cursus libero.
);

URLs will be all sorts of forms, what I need is an array of those links. Something like this:

Array
(
    [1] => http://www.google.com/search?q=stackoverflow
    [2] => http://www.google.com/search?q=stackoverflow&ie=utf-8
    [3] => http://www.google.com/search?q=stackoverflow&ie=utf-8
);

Answer 1

The code for you:

$pattern = '/((https?|ftp)\:(\/\/)|(file\:\/{2,3}))?(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))|(((([a-zA-Z0-9]+)(\.)?)+)(\.)(com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|[a-z]{2}))([\/][\/a-zA-Z0-9\.]*)*([\/]?(([\?][a-zA-Z0-9]+[\=][a-zA-Z0-9\%\(\)]*)([\&][a-zA-Z0-9]+[\=][a-zA-Z0-9\%\(\)]*)*))?/';

$a = array(
    'Lorem ipsum dolor sit amet http://www.google.com/search?q=stackoverflow consectetur adipiscing elit.',
    'Phasellus tempor vehicula fringilla. www.google.com/search?q=stackoverflow&ie=utf-8',
    'google.com/search?q=stackoverflow&ie=utf-8 Aenean in cursus libero.',
);

$urls = array();

foreach($a as $line)
{
    if(!preg_match($pattern, $line, $match))
        continue;

    $urls[] = $match[0];
}

var_dump($urls);

The regular expression was taken from here and corrected a bit.