var URL = /(https?:////|ftps?:////)?((/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3})(:[0-9]+)?|(localhost)(:[0-9]+)?|([/w]+/.)(/S+)(/w{2,4})(:[0-9]+)?)(//?([/w#!:.?+=&%@!/-//]+))?/ig;

/**
 * JavaScrit 版本
 * 將URL地址轉化為完整的A標簽鏈接代碼
 */
var replaceURLToLink = function (text) {
        text = text.replace(URL, function (url) {
            var urlText = url;
            if (!url.match('^https?:////')) {
                url = 'http://' + url;
            }
            return '' + urlText + '';
        });

        return text;
    };

/**
 * PHP 版本 在 Silva 代碼的基礎上修改的
 * 將URL地址轉化為完整的A標簽鏈接代碼
 */
/** =============================================
 NAME        : replace_URLtolink()
 VERSION     : 1.0
 AUTHOR      : J de Silva
 DESCRIPTION : returns VOID; handles converting
 URLs into clickable links off a string.
 TYPE        : functions
 ============================================= */

function replace_URLtolink($text) {
    // grab anything that looks like a URL...
    $urls = array();
   
    // build the patterns
    $scheme = '(https?/:////|ftps?/:////)?';
    $www = '([/w]+/.)';
    $local = 'localhost';
    $ip = '(/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3})';
    $name = '([/w0-9]+)';
    $tld = '(/w{2,4})';
    $port = '(:[0-9]+)?';
    $the_rest = '(//?([/w#!:.?+=&%@!/-//]+))?';
    $pattern = $scheme.'('.$ip.$port.'|'.$www.$name.$tld.$port.'|'.$local.$port.')'.$the_rest;
    $pattern = '/'.$pattern.'/is';
   
    // Get the URLs
    $c = preg_match_all($pattern, $text, $m);
   
    if ($c) {
        $urls = $m[0];
    }
   
    // Replace all the URLs
    if (! empty($urls)) {
        foreach ($urls as $url) {
            $pos = strpos('http/:////', $url);
           
            if (($pos && $pos != 0) || !$pos) {
                $fullurl = 'http://'.$url;
            } else {
                $fullurl = $url;
            }
           
            $link = ''.$url.'';
           
            $text = str_replace($url, $link, $text);
        }
    }
   
    return $text;
}