PHP Regex to get src value

gistfile1.php

<?php
$input_string = '<script type="text/javascript" src="http://localhost/assets/javascript/system.js" charset="UTF-8"></script>';
$count = preg_match('/src=(["\'])(.*?)\1/', $input_string, $match);
if ($count === FALSE) 
    echo('not found\n');
else 
    echo($match[2] . "\n");

$input_string = "<script type='text/javascript' src='http://localhost/index.php?uid=93db46d877df1af2a360fa2b04aabb3c' charset='UTF-8'></script>";
$count = preg_match('/src=(["\'])(.*?)\1/', $input_string, $match);
if ($count === FALSE) 
    echo('not found\n');
else 
    echo($match[2] . "\n");
?>

cool