js正则表达式匹配url（正则url判断）

用Javascript解析链接(URL)是一个常见的需求，本文介绍了一个非常健全的用Javascript写的链接(URL)解析类，他可以准确获取一个完整的URL中每个部分的内容，包括协议、URL中包含的用户名和密码、主机名、端口、路径名、参数、锚点(FragmentAnchor)等信息。

<body> <div id="example"> <div id="example_main"> <script type="text/javascript"> if (typeof Poly9 == 'undefined') { var Poly9 = {}; } Poly9.URLParser = function(url) { this._fields = { 'Username' : 4, 'Password' : 5, 'Port' : 7, 'Protocol' : 2, 'Host' : 6, 'Pathname' : 8, 'URL' : 0, 'Querystring' : 9, 'Fragment' : 10 }; this._values = {}; this._regex = null; this.version = 0.1; this._regex = /^((\w+):\/\/)?((\w+):?(\w+)?@)?([^\/\?:]+):?(\d+)?(\/?[^\?#]+)?\??([^#]+)?#?(\w*)/; for(var f in this._fields) { this['get' + f] = this._makeGetter(f); } if (typeof url != 'undefined') { this._parse(url); } } Poly9.URLParser.prototype.setURL = function(url) { this._parse(url); } Poly9.URLParser.prototype._initValues = function() { for(var f in this._fields) { this._values[f] = ''; } } Poly9.URLParser.prototype._parse = function(url) { this._initValues(); var r = this._regex.exec(url); if (!r) throw "DPURLParser::_parse -> Invalid URL"; for(var f in this._fields) if (typeof r[this._fields[f]] != 'undefined') { this._values[f] = r[this._fields[f]]; } } Poly9.URLParser.prototype._makeGetter = function(field) { return function() { return this._values[field]; } } var url = 'http://user:password@www.zzvips.com:1234/test/test.asp?id=1#test'; var p = new Poly9.URLParser(url); document.write("URL: " + url + " "); document.write("解析结果如下： "); document.write("协议: " + p.getProtocol() + " "); document.write("用户: " + p.getUsername() + " "); document.write("密码: " + p.getPassword() + " "); document.write("主机: " + p.getHost() + " "); document.write("端口: " + p.getPort() + " "); document.write("路径: " + p.getPathname() + " "); document.write("查询字符串: " + p.getQuerystring() + " "); document.write("锚点: " + p.getFragment() + " "); </script> </div> </div> </body>