javascript正则表达式

<p>一个非常好的入门教程<a title="30分钟入门" href="http://deerchao.net/tutorials/regex/regex.htm" target="_blank">link</a></p>
<p><a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/RegExp" target="_blank">MDN介绍</a></p>
<p><a href="http://regexpal.com/" target="_blank">测试</a></p>
<p><a href="http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/" target="_blank">参考纸条</a></p>