我怎样才能“反向匹配"?用正则表达式? [英] How can I "inverse match" with regex?

问题描述

我正在逐行处理一个文件，我想做一个反向匹配.例如，我想匹配包含六个字母的字符串的行，但前提是这六个字母不是Andrea".我该怎么做?

I'm processing a file, line-by-line, and I'd like to do an inverse match. For instance, I want to match lines where there is a string of six letters, but only if these six letters are not 'Andrea'. How should I do that?

我正在使用 RegexBuddy，但仍有问题.

I'm using RegexBuddy, but still having trouble.

推荐答案

(?!Andrea).{6}

假设您的正则表达式引擎支持负前瞻...

Assuming your regexp engine supports negative lookaheads...

...或者您可能更喜欢使用 [A-Za-z]{6} 代替 .{6}

...or maybe you'd prefer to use [A-Za-z]{6} in place of .{6}

请注意，前瞻和后视通常不是逆向"的正确方法.正则表达式匹配.正则表达式并不是真正为进行负匹配而设置的；他们将其留给您使用它们的任何语言.

Note that lookaheads and lookbehinds are generally not the right way to "inverse" a regular expression match. Regexps aren't really set up for doing negative matching; they leave that to whatever language you are using them with.

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