- preg_replace: documentation ( source)
<?php
$urlRegex = '#(^|\\b)https?:\/\/[\w.?;:\)"=&_/\#]+#';
$text = 'example url [http://www.example.com/path/index?ATY345=6&index=2#utm=feafet/] blabhablha';
$text = preg_replace($urlRegex, '', $text);
print("text is $text \n");