在CSV文件中查找未转义的双引号的正则表达式

问题描述

正则表达式是什么来找到由两个非转义双引号组成的集合，这些双引号包含在CSV文件中双引号引起的列中？

What would a regular expression be to find sets of 2 unescaped double quotes that are contained in columns set off by double quotes in a CSV file?

不匹配：

"asdf","asdf"
"", "asdf"
"asdf", ""
"adsf", "", "asdf"

匹配：

"asdf""asdf", "asdf"
"asdf", """asdf"""
"asdf", """"

推荐答案

尝试：

(?m)""(?![ \t]*(,|$))

说明：

(?m)       // enable multi-line matching (^ will act as the start of the line and $ will act as the end of the line (i))
""         // match two successive double quotes
(?!        // start negative look ahead
  [ \t]*   //   zero or more spaces or tabs
  (        //   open group 1
    ,      //     match a comma 
    |      //     OR
    $      //     the end of the line or string
  )        //   close group 1
)          // stop negative look ahead

所以，用简单的英语：匹配两个连续的双引号，只有在他们之前没有逗号或行尾的时候，才可以在之间插入空格和制表符。

So, in plain English: "match two successive double quotes, only if they DON'T have a comma or end-of-the-line ahead of them with optionally spaces and tabs in between".

i）除了是正常的开始字符串和结束字符串元字符。

(i) besides being the normal start-of-the-string and end-of-the-string meta characters.

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