我想匹配的单词列表是很容易的，当这些话是真的话。例如 / \ B（流行|推送）\ B / GSX 时，对字符串跑

I'm wanting to match a list of words which is easy enough when those words are truly words. For example /\b (pop|push) \b/gsx when ran against the string

弹出了门一推，但它突然出现回

pop gave the door a push but it popped back

将匹配单词流行和推动，但没有弹出。

will match the words pop and push but not popped.

我需要为包含通常有资格作为单词边界字符的话类似的功能。所以，我需要 / \ B（反|！推）\ B / GSX 时，对字符串跑

I need similar functionality for words that contain characters that would normally qualify as word boundaries. So I need /\b (reverse!|push) \b/gsx when ran against the string

推逆转！逆转！推

要只匹配逆转！推而不能匹配逆转！推。显然，这正则表达式是不会做，这样做什么，我需要用\的B，而不是让我的正则表达式足够的智慧来处理这些时髦的要求？

to only match reverse! and push but not match reverse!push. Obviously this regex isn't going to do that so what do I need to use instead of \b to make my regex smart enough to handle these funky requirements?

推荐答案

目前一个字的结尾，\ B表示的previous字符是一个字符，和下一个字符（如果存在下一字符）不是一个单词字符要删除的第一个条件，因为有可能是在对字那给你留下一个负超前末尾的非单词字符：

At the end of a word, \b means "the previous character was a word character, and the next character (if there is a next character) is not a word character. You want to drop the first condition because there might be a non-word character at the end of the "word". That leaves you with a negative lookahead:

/\b (reverse!|push) (?!\w)/gx

我是pretty的肯定AS3正则表达式支持向前看。

I'm pretty sure AS3 regexes support lookahead.