正则表达式：HTML中的可选HTML标签？

Question

我需要从HTML解析一些值。

Answer 1

You can't parse (X)HTML with RegEx , so don't do it. You need to use a proper parser that will build you a Document Object Model (DOM). As you have tagged your question with JavaScript, I recommend that you use jQuery to build an object graph of your HTML, simply like this:

var $document = $(html);

This $document object can now be operated on with methods like $document.find() to dig out the elements you want from the HTML.