如何使用正则表达式识别不以斜杠字符 ('/') 结尾的字符串? [英] How do I recognize strings that do not end with a slash character ('/') using a regex?

问题描述

如何匹配不以 / 结尾的字符串.我知道我可以这样做 /\/$/ 并且如果字符串确实以 / 结尾，它将匹配，但是我如何测试以查看它是否没有?

How can i match a string that does not finish with / . I know I can do that /\/$/ and it will match if string does finish with /, but how can I test to see if it doesn't?

推荐答案

您可以使用否定的 字符班级:

/[^\/]$/

然而，这要求字符串至少包含一个字符.如果您还想允许空字符串，您可以使用替代:

This however requires that the string contains at least one character. If you also want to allow the empty string you can use an alternation:

/[^\/]$|^$/

另一种方法是使用否定的 lookbehind 但请注意许多流行的正则表达式引擎不支持后视:

A different approach is to use a negative lookbehind but note that many popular regular expression engines do not support lookbehinds:

/(?<!\/)$/

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