regex to get html tag attribute value

get_attr_value.php

<?php

/**
 * regex to get html tag attribute value
 */
function get_attribute_value($attrib, $tag){
    //get attribute from html tag
    $re = '/' . preg_quote($attrib) . '=([\'"])?((?(1).+?|[^\s>]+))(?(1)\1)/is';
    if (preg_match($re, $tag, $match)) {
      return urldecode($match[2]);
    }
    return false;
}