本文介绍了正则表达式匹配多个否定先行的处理方法,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
仅在字符串不以"abc:"或"defg:"开头的情况下,我才尝试匹配一个字符串(使用Perl正则表达式),但是我似乎找不到答案.我已经尝试过类似的
I'm trying to match a string (using a Perl regex) only if it doesn't start with "abc:" or "defg:", but I can't seem to find out how. I've tried something like
^(?:(?!abc:)|(?!defg:))推荐答案
先行者(?=foo),(?!foo)和后方(?<=foo),(?<!foo)不使用任何字符.
Lookahead (?=foo), (?!foo) and lookbehind (?<=foo), (?<!foo) do not consume any characters.
您可以执行多个断言:
^(?!abc:)(?!defg:)或:
^(?!defg:)(?!abc:)...而且顺序没有什么不同.
...and the order does not make a difference.
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正则表达式匹配多个否定先行
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