正则表达式匹配未转义的引号 [英] Regex match unescaped quotes

问题描述

我正在寻找匹配任意字符串中未转义引号的正则表达式，但不匹配已转义的引号，以便我可以转义未转义的引号.我尝试修改我发现的任何类似解决方案，但没有完全满足我的需求.

I'm looking for a regex that matches unescaped quotes in an arbitrary string, but not quotes that are already escaped so I can escape the unescaped quotes. I tried to modify any similar solutions I found but nothing captured exactly what I need.

正则表达式应该

abc"asd # match
abc\"asd # not match
abc\\"asd # match
abc\\\"asd # not match
abc\\\\"asd # match

所以基本上匹配以偶数个反斜杠(包括零)开头的任何引号，但不匹配以奇数个反斜杠开头的任何引号.

so basically match any quotes preceded by an even number of backslashes (including zero) but not match any quotes preceded by an odd number of backslashes.

有人可以帮忙吗?

PS:我想用 ruby​​ 来做这个

PS: I want to do this in ruby

推荐答案

你可以使用这个:

(?<!\\)(?:\\{2})*\K"

(?<!\\) 检查之前没有反斜杠(负向后视)

(?<!\\) checks there is no backslash before (negative lookbehind)

(?:\\{2})* 匹配所有偶数个反斜杠

(?:\\{2})* matches all even numbers of backslashes

\K 从匹配结果中删除左侧的所有内容(此处为反斜杠)

\K removes all on the left from the match result (the backslashes here)

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