PHP Autolink Text

fabs_linkify.php

function fabs_linkify($str){
    $re = "/(([a-z0-9\$\-\_\.\+\!\*'\(\)\,]+)\@)?((https?\:\/\/)?(www\.)?([a-z0-9\$\-\_\.\+\!\*'\(\)\,\/]+)\.(com|org|net|gov|us|tv)(\/[a-z0-9\$\-\_\.\+\!\*'\(\)\,\/]+)?)/i";
    return preg_replace_callback($re, 'fabs_linkify_callback', $str);
}

function fabs_linkify_callback($matches){
    if( $matches[1] ) {
        return '<a href="mailto:'.$matches[0].'">'.$matches[0].'</a>';
    }
    else{
        $url = $matches[0];
        if( strpos($url, 'http') !== 0 ){
            $url = 'http://'.$url;
        }
        return '<a href="'.$url.'" target="_blank">'.$url.'</a>';
    }
}