FireFox无效正则表达式组 [英] FireFox invalid regex group

问题描述

我有以下正则表达式在 chrome 的问题中正常工作a>，但在FireFox中不起作用，生成语法错误Invalid Regex Group:

I have the following regex that works fine in chrome but it does not work in FireFox generating syntax error Invalid Regex Group:

bld = txt.split(/(?<=:)/iu,1);

我尝试使用/(?<=\:)/iu转义:，但是它给出了相同的错误.我无法找出造成此问题的原因.

I have tried to escape : using /(?<=\:)/iu but it gives the same error. I could not able to figure out the cause of this problem.

推荐答案

您可以看到 ，到目前为止，并非在所有浏览器/JavaScript环境中都支持向后搜索.因此，如果要支持所有浏览器(包括旧版本)，则实际上不能依赖该功能.

As you can see here, as of now, lookbehinds are not supported in every browser/JavaScript environment. Thus, you can't actually rely on that feature if you want to support all browsers including legacy versions.

由于您只想匹配除:和字符串中的第一个:之外的0+个字符，因此可以使用

Since you just want to match 0+ chars other than : and the first : in the string, you may use

s.match(/^[^:]*:/)

请参见 regex演示.

JS:

console.log(
 'Error 5: the lorem lipsum: in...'.match(/^[^:]*:/)[0]
);

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