本文介绍了正则表达式不以点开头或以点结尾的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要一个不以点开头或以[-_.]结尾的正则表达式.
I need a regular expression that does not start with a dot or end with [-_.].
这个正则表达式有效,但在第一个条件下失败;它不以点开头:
This regex works but fails for the first condition; it does not start with dot:
^[A-Za-z0-9][^.]*[^-_.][A-Za-z0-9]$例如:test 应该是一个有效的字符串,但它失败了.
For example: test should be a valid string but it fails.
推荐答案从您的上一个问题,您应该能够使用:
From your previous question, you should be able to use:
^[^.].*[^-_.]$但是如果您希望能够匹配 1 个字符的字符串,您将需要负前瞻:
But if you want to be able to match a 1 character string, you will need negative lookaheads:
^(?![.])(?!.*[-_.]$).+如果您也想匹配空字符串,只需使用 * 而不是 +.
And if you want to match empty strings too, simply use * instead of +.
^(?![.])(?!.*[-_.]$).*更多推荐
正则表达式不以点开头或以点结尾
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