如何否定整个正则表达式? [英] How to negate the whole regex?
问题描述
我有一个正则表达式，例如 (ma|(t){1}).它匹配 ma 和 t 并且不匹配 bla.
I have a regex, for example (ma|(t){1}). It matches ma and t and doesn't match bla.
我想否定正则表达式，因此它必须匹配 bla 而不是 ma 和 t，为此添加一些东西正则表达式.我知道我可以写 bla，但实际的正则表达式更复杂.
I want to negate the regex, thus it must match bla and not ma and t, by adding something to this regex. I know I can write bla, the actual regex is however more complex.
推荐答案
Use negative lookaround: (?!pattern)
Use negative lookaround: (?!pattern)
积极环顾可用于断言模式匹配.负环顾相反:它用于断言模式不匹配.有些风格支持断言；有些对后视等进行了限制.
Positive lookarounds can be used to assert that a pattern matches. Negative lookarounds is the opposite: it's used to assert that a pattern DOES NOT match. Some flavor supports assertions; some puts limitations on lookbehind, etc.
这些尝试为玩具问题提出正则表达式解决方案作为练习；如果您正在尝试学习使用环视的各种方式(嵌套它们、使用它们进行捕获等)，它们应该具有教育意义:
These are attempts to come up with regex solutions to toy problems as exercises; they should be educational if you're trying to learn the various ways you can use lookarounds (nesting them, using them to capture, etc):
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