AS3 RegExp 用于匹配单词及其中的边界类型字符
我想要匹配一个单词列表，当这些单词是真正的单词时，这很容易。 例如 /\b (pop|push) \b/gsx 当针对字符串运行时
啪的一声推了门，但门又弹了回来
将匹配单词 pop 和 push 但没有 poped。
对于包含通常符合单词边界的字符的单词，我需要类似的功能。 因此，当针对字符串运行时，我需要 /\b (reverse!|push) \b/gsx
反向推！ 反向！推
只匹配反向！ 和push 但不匹配reverse!push。 显然这个正则表达式不会这样做，所以我需要使用什么来代替 \b 来使我的正则表达式足够智能来处理这些时髦的要求？
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
pop gave the door a push but it popped back
will match the words pop and push but not popped.
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
push reverse! reverse!push
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?
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在单词末尾，\b 表示“前一个字符是单词字符，下一个字符（如果有下一个字符）不是单词字符。您要删除第一个条件，因为可能存在非单词字符” “word”末尾的 -word 字符会给您带来负面的前瞻：
我很确定 AS3 正则表达式支持前瞻。
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:
I'm pretty sure AS3 regexes support lookahead.
您的第一个问题是您的轮换中需要三个（可能是四个）案例，而不是两个。
/\breverse!(?:\s|$)/反转！ 单独/\bpush\b/单独推送/\breverse!push\b/一起/\bpushreverse!(?:\s|$)/这是可能的情况您的第二个问题是
\b在"!"之后不会匹配，因为它不是\w。 以下是 Perl 5 对\b的说法，您可能需要咨询您的文档以查看他们是否同意：因此，您需要的正则表达式就像
我省略了
/s 因为这个正则表达式中没有句点，所以视为单行是没有意义的。 如果/s并不意味着将其视为引擎中的一行，您可能应该将其添加回来。 另外，您应该了解您的引擎如何处理交替。 我知道在 Perl 5 中，为了获得正确的行为，您必须以这种方式排列项目（否则，reverse! 总是会战胜 reverse!push）。Your first problem is that you need three (possibly four) cases in your alternation, not two.
/\breverse!(?:\s|$)/reverse! by itself/\bpush\b/push by itself/\breverse!push\b/together/\bpushreverse!(?:\s|$)/this is the possible caseYour second problem is that a
\bwon't match after a"!"because it is not a\w. Here is what Perl 5 has to say about\b, you may want to consult your docs to see if they agree:So, the regex that you need is something like
I left out the
/sbecause there are not periods in this regex, so treat as single line makes no sense. If/sdoesn't mean treat as a single line in your engine you should probably add it back. Also, you should read up on how your engine handles alternation. I know in Perl 5 to get the right behaviour you must arrange the items this way (otherwise reverse! would always win over reverse!push).您可以将 \b 替换为等效的但不太严格的内容：
这样
\b的限制因素（它只能匹配实际\w单词之前或之后）字符）被删除。现在，空格或字符串的开头/结尾可以作为有效的分隔符，并且内部表达式可以在运行时轻松构建，例如从搜索词列表中构建。
You can replace \b by something equivalent, but less strict:
This way the limiting factor of the
\b(that it can only match before or after an actual\wword character) is removed.Now white space or the start/end of the string function as valid separators, and the inner expression can be easily built at run-time, from a list of search terms for example.