Find URL in String

gistfile1.php

<?php
 
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
 
$text = "Visite: http://google.com e pesquise antes de perguntar.";

if(preg_match($reg_exUrl, $text, $url)) {
       echo preg_replace($reg_exUrl, "<a href=$url[0]>$url[0]</a>", $text);
} else {
       echo $text;
}