为什么我不能在单词边界旁边使用重音字符？ [英] Why can't I use accented characters next to a word boundary?

问题描述

我正在尝试制作一个与人名相匹配的动态正则表达式。它在大多数名字上都没有问题，直到我在名字的末尾遇到重音字符。

I'm trying to make a dynamic regex that matches a person's name. It works without problems on most names, until I ran into accented characters at the end of the name.

示例：一些FancyNamé

Example: Some Fancy Namé

我到目前为止使用的正则表达式是：

The regex I've used so far is:

/\b(Fancy Namé|Namé)\b/i

像这样使用：

"Goal: Some Fancy Namé. Awesome.".replace(/\b(Fancy Namé|Namé)\b/i, '<a href="#">$1</a>');

这根本不匹配。如果我用e替换é，它就匹配得很好。
如果我尝试匹配诸如SomeFancyNaméa这样的名字，它就可以了。
如果我删除单词的最后一个边界锚，它就可以正常工作。

This simply won't match. If I replace the é with a e, it matches just fine. If I try to match a name such as "Some Fancy Naméa", it works just fine. If I remove the word last word boundary anchor, it works just fine.

为什么单词boundary flag不在这里？关于如何解决这个问题的任何建议？

Why doesn't the word boundary flag work here? Any suggestions on how I would get around this problem?

我考虑过使用类似的东西，但我不确定性能惩罚是什么样的：

I have considered using something like this, but I'm not sure what the performance penalties would be like:

"Some fancy namé. Allow me to ellaborate.".replace(/([\s.,!?])(fancy namé|namé)([\s.,!?]|$)/g, '$1<a href="#">$2</a>$3')

建议？想法？

推荐答案

JavaScript的正则表达式实现不支持Unicode。它只知道标准低字节ASCII中的单词字符，它不包括é或任何其他重音或非英语字母。

JavaScript's regex implementation is not Unicode-aware. It only knows the ‘word characters’ in standard low-byte ASCII, which does not include é or any other accented or non-English letters.

因为é不是JS的单词字符，é后跟空格可以永远不会被视为单词边界。 （如果在单词中间使用，它将匹配 \ b ，例如Namés。）

Because é is not a word character to JS, é followed by a space can never be considered a word boundary. (It would match \b if used in the middle of a word, like Namés.)

/（[\。。，！？]）（花式namé|namé）（[\。，！ ？] | $）/

是的，这将是JS的常用解决方法（尽管可能与更多标点符号）。对于其他语言，你通常使用lookahead / lookbehind来避免匹配前后边界字符，但这些在JS中支持不足/错误，所以最好避免。

Yeah, that would be the usual workaround for JS (though probably with more punctuation characters). For other languages you'd generally use lookahead/lookbehind to avoid matching the pre and post boundary characters, but these are poorly supported/buggy in JS so best avoided.

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