regex 如何告诉egrep不接受哪些字符

o8x7eapl 于 2023-06-30 发布在其他

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我想接受以s开头的字符串，而不是下一个字符（无论它是什么）必须在脚本中包含两次以上（但不能更少，也不能更多），并且在此字符之前不能是反斜杠。所以：

s(.)[now some chars except (.) and not ending with \]\1[some chars but not (.) and not ending with \]\1[some chars but not (.)]

\1和（.）和s是正则表达式的真实的部分

regex

来源：https://stackoverflow.com/questions/5449547/how-to-tell-egrep-which-characters-not-to-accept

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按热度按时间

yqhsw0fo1#

我不认为白鹭会成功。
你需要一个可以做lookaheadAssert的grep，原因如下：
/^ s (.) (?:(?:\\.|(?!\1).)+\1){2} (?:\\.|(?!\1).)+ $/xs

/^             # Begin of string
     s
     (.)                # capture first char after 's'
     (?:                # Begin Grp
         (?: \\.          # begin grp, escaped anything
           | (?!\1).        # OR, any char that is not (.)
         )+               # end grp, do this more than once
         \1               # Followed by (.)
     ){2}               # End Grp, do this exactly twice

     (?: \\.            # begin grp, escaped anything
       | (?!\1).           # OR, anchar that is not (.)
     )+                 # end grp, do this more than once

 $/xs         # End of string, x and s modifiers

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regex 如何告诉egrep不接受哪些字符

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