满足www类型的

//$url_message = preg_match_all('/(https?:\/\/)?([\da-z-\.]+)\.([a-z]{2,6})([\/\w \.-?&%-]*)*\/?/',$message,$urlall);

满足http://类型的

$url_message = preg_match_all('/(http|https|ftp|file){1}(:\/\/)?([\da-z-\.]+)\.([a-z]{2,6})([\/\w \.-?&%-=]*)*\/?/',$message,$urlall);

正则匹配url地址：

$preg="/^(https?:\/\/)?(((www\.)?[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)?\.([a-zA-Z]+))|(([0-1]?[0-9]?[0-9]|2[0-5][0-5])\.([0-1]?[0-9]?[0-9]|2[0-5][0-5])\.([0-1]?[0-9]?[0-9]|2[0-5][0-5])\.([0-1]?[0-9]?[0-9]|2[0-5][0-5]))(\:\d{0,4})?)(\/[\w- .\/?%&=]*)?$/i"; //用于匹配的正则表达式