不以序列开头的字符串的正则表达式 [英] Regular expression for a string that does not start with a sequence

问题描述

我正在使用这个程序处理一堆表格，但我需要忽略以标签tbd_".到目前为止，我有类似 [^tbd_] 的东西，但根本不匹配这些字符.

I'm processing a bunch of tables using this program, but I need to ignore ones that start with the label "tbd_". So far I have something like [^tbd_] but that simply not match those characters.

推荐答案

你可以使用一个消极的外观-ahead 断言:

You could use a negative look-ahead assertion:

^(?!tbd_).+

或者否定的后视断言:

(^.{1,3}$|^.{4}(?<!tbd_).*)

或者只是简单的旧字符集和替换:

Or just plain old character sets and alternations:

^([^t]|t($|[^b]|b($|[^d]|d($|[^_])))).*

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