Update: A beta version of XRegExp 0.3 is now available as part of the RegexPal download package.
Javascr ipt’s regular expression flavor doesn’t support named capture. Well, says who? XRegExp 0.2 brings named capture support, along with several other
http://regexpal.com/
上面这个网站可以用于在线检测JS的正则表达式语法
除了熟知的几个固定字符表示位置：
^ : Match the beginning of the string and, in multiline searches, the beginning of a line.
$ : Match the end of the string and, in multiline searches, the end of a line.
\b:
Match a wor
