这个RegEx的哪个部分导致它在IE7和IE8中找不到匹配项？ [英] What part of this RegEx is causing it to find no matches in IE7 and IE8?

问题描述

我有一个正则表达式，查找< span> ，类名为 foobar 。它适用于IE9，Chrome和Firefox。它在IE7和IE8中失败了。谁能告诉我为什么？

I've got a regex that looks for a <span> with the class name foobar. It works in IE9, Chrome and Firefox. It's failing in IE7 and IE8. Can anyone tell me why?

new RegExp( /(\s*?)<span\b(?:.*?)(?:class=(?:'|"|.*?\s)?foobar(?:\s|\3))(?:.*?)(?:\/)?>(.+?)<\/span>(\s*?)/g )

推荐答案

如果您正在对来自getElementById（）。innerHTML或jQuery .html（）的html应用正则表达式，那么IE将大写HTML标签，这可能是问题。如果你制作正则表达式不区分大小写 - 也就是说，最后将修饰符 / g 更改为 / gi - 这样可以解决吗？

If you're applying the regex against html you got from getElementById().innerHTML or jQuery .html(), IE will uppercase the HTML tags which could be the problem. If you make the regex case-insensitive - that is, change the modifier /g to /gi at the end - does that fix it ?

看起来你也正在混合使用正则表达式文字和RegExp对象语法，你可以只使用正则表达式文字。

It seems like you're also mixing the regex literal and RegExp object syntax, you can do it with just the regex literal instead.

var regex = /(\s*?)<span\b(?:.*?)(?:class=(?:'|"|.*?\s)?foobar(?:\s|\3))(?:.*?)(?:\/)?>(.+?)<\/span>(\s*?)/gi;

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