PHP find all links in the text

I'd go with something simple like ~[a-z]+://\S+~i

• starts with protocol [a-z]+://
• \S+ followed by one or more non-whitespaces where \S is a shorthand for [^ \t\r\n\f]
• used modifier i (PCRE_CASELESS) (possibly not really necessery)

---

So it could look like this:

$pattern = '~[a-z]+://\S+~';

$str = 'Test text http://hello.world Test text 
http://google.com/file.jpg Test text https://hell.o.wor.ld/test?qwe=qwe Test text 
test text http://test.test/test';

if($num_found = preg_match_all($pattern, $str, $out))
{
  echo "FOUND ".$num_found." LINKS:\n";
  print_r($out[0]);
}

outputs:

FOUND 4 LINKS:
Array
(
    [0] => http://hello.world
    [1] => http://google.com/file.jpg
    [2] => https://hell.o.wor.ld/test?qwe=qwe
    [3] => http://test.test/test
)

Test on eval.in

function turnUrlIntoHyperlink($string){
    //The Regular Expression filter
    $reg_exUrl = "/(?i)\b((?:https?:\/\/|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'\".,<>?«»“”‘’]))/";

    // Check if there is a url in the text
    if(preg_match_all($reg_exUrl, $string, $url)) {

        // Loop through all matches
        foreach($url[0] as $newLinks){
            if(strstr( $newLinks, ":" ) === false){
                $link = 'http://'.$newLinks;
            }else{
                $link = $newLinks;
            }

            // Create Search and Replace strings
            $search  = $newLinks;
            $replace = '<a href="'.$link.'" title="'.$newLinks.'" target="_blank">'.$link.'</a>';
            $string = str_replace($search, $replace, $string);
        }
    }

    //Return result
    return $string;
}

Works like a charm. use this.

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