[AZ]{2,4}不限于2与1之间。 4 个字符
PCRE: /\A[A-Z0-9_\.%\+\-]+@(?:[A-Z0-9\-]+\.)+(?:[a-z]{2,4}|museum|travel)\z/i
POSIX: /^[A-Z0-9_\.%\+\-]+@(?:[A-Z0-9\-]+\.)+(?:[A-Z]{2,4}|museum|travel)$/i
这个正则表达式在各个方面都满足我的需求，除了它允许诸如 [email protected ]。它说这些是匹配的。如果我没记错的话，[AZ]后面的{2,4}不是意味着它必须在2到4个字符之间吗？会不会是争吵、博物馆和旅行的问题？我已经验证这些在我的应用程序中是允许通过的，还有一些正则表达式测试人员。 另外，我不清楚我是否正确执行了 PCRE 和 POSIX。我担心他们可能都是PCRE，我太可笑了。 AFAIK，JavaScript 是 POSIX，Ruby 是 PCRE。所以，如果我没有做到这一点，请让我轻松下来，这是学习正则表达式的一个漫长而漫长的夜晚，进进出出，我试图让自己看起来很糟糕。 :)
PCRE: /\A[A-Z0-9_\.%\+\-]+@(?:[A-Z0-9\-]+\.)+(?:[a-z]{2,4}|museum|travel)\z/i
POSIX: /^[A-Z0-9_\.%\+\-]+@(?:[A-Z0-9\-]+\.)+(?:[A-Z]{2,4}|museum|travel)$/i
This regex is correct in every way for my needs except that it allows emails such as [email protected]. It says these are a match. If I'm not mistaken, doesn't the {2,4} after [A-Z] mean that it has to be between 2 and 4 characters? Could it be a problem with the altercation and museum and travel? I have verified that these are allowed through in my application, and a few regex testers. Also, I'm fuzzy on whether I did do the PCRE and POSIX correctly. I fear they might both just be PCRE and I'm being ridiculous. AFAIK, JavaScript is POSIX and Ruby is PCRE. So if I didn't get that right, lemme down easy, it has been a long, long night of learning regexes, in and out, and I'm trying to look badass. :)
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确实如此，但它仅适用于顶级域名（示例中的“com”）。
It does, but it's only applied to the top-level domain name (the "com" in your example).
Ruby 正则表达式文档：
Ruby regular expression documentation:
POSIX 不支持非捕获组
(?:group)因此您的正则表达式都不是 POSIX。 JavaScript 不使用 POSIX。 JavaScript 正则表达式是 Perl 风格的，但它不具备所有功能。有关详细信息，请查看我网站上的正则表达式风格比较。POSIX does not support non-capturing groups
(?:group)so neither of your regexes are POSIX. JavaScript does not use POSIX. JavaScript regular expressions are Perl-style but it doesn't have all the features. Check the regex flavor comparison on my site for details.