regex 正则表达式匹配不在引号内的字符

r9f1avp5 于 2023-08-08 发布在其他

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我有一个包含自定义代码的文件，例如：

#include "folder/file.txt"
#include "folder with spaces/file.txt"
#include "$variable/file.txt"
#define $foo joe
#define $bar 34

字符串
我想使用RegEx匹配从每一行中提取值。JavaScript RegEx（如[^#"\s]+）可以正确匹配大多数值，除了引号内的空格：

include
folder/file.txt
include
folder
with
spaces/file.txt
include
$variable/file.txt
define
$foo
joe
define
$bar
34

型
https://regex101.com/r/AmAh3T/1
我想忽略引号中的空格，这样匹配值的列表就变成了：

include
folder/file.txt
include
folder with spaces/file.txt
include
$variable/file.txt
define
$foo
joe
define
$bar
34

型
我尝试过使用lookahead来忽略引号内的空格[^\s]+(?=(?:[^"]|["][^"]*["])*$)，但这会忽略引号内空格之前的任何字符串：

include
"folder/file.txt"
include
spaces/file.txt"
include
"$variable/file.txt"
define
$foo
joe
define
$bar
34

型
https://regex101.com/r/WbU0X2/2的
我怎么能以更好的方式做到这一点？

regex

来源：https://stackoverflow.com/questions/76759536/regex-match-characters-not-inside-quotes

1条答案

按热度按时间

r55awzrz1#

考虑匹配正则表达式

(?<=")[^#"]+(?=")|[^# \r\n"]+

字符串
g（“global”，第一次匹配后不返回）标志已设置。
Demo
该表达式可以分解如下。

(?<=")       # positive lookbehind asserts that the match is preceded
             # by a double quote
[^#"]+       # match one or more (`+`) characters other than (`^`) those
             # listed in the character class
(?=")        # positive lookahead asserts that the match is followed
             # by a double quote
|            # or
[^# \r\n"]+  # match one or more (`+`) characters other than (`^`) those
             # listed in the character class

型
或者（或另外），将光标悬停在链接处表达式的每个部分上，以获得其功能的解释。

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regex 正则表达式匹配不在引号内的字符

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