正则表达式匹配关键字不在引号 [英] regex match keywords that are not in quotes

问题描述

我如何能够寻找不属于字符串中kewords

How will I be able to look for kewords that are not inside a string.

例如，如果我有文字：

您好这段文字就是一个例子。

Hello this text is an example.

唧唧歪歪这段文字是一个字符串里面的

bla bla bla "this text is inside a string"

随机字符串更多的文字唧唧歪歪富

"random string" more text bla bla bla "foo"

我会喜欢要能够匹配所有不在里面，字文本。在其他的我会想匹配的：

I will like to be able to match all the words text that are not inside " ". In other I will like to match:

请注意，我不希望这是在红色突出显示文本匹配，因为它是一个字符串

note I do not want to match the text that is highlighted on red because it is inside a string

可能的解决方法：

我一直在努力，这就是我到目前为止：（？S）

I been working on it and this is what I have so far:

（？（小于q>中？。？）|文）（（q）*| ）

注意，正则表达式使用if语句为：（？（谓语）正确的选择|假替代）

note that regex uses the if statement as: (?(predicate) true alternative|false alternative)

所以正则表达式将读取：

so the regex will read:

查找或文字。如果你找。然后继续选择，直到你找到了（。*？）如果您发现文，然后什么也不做......

find " or text. If you find " then continue selecting until you find " again (.*?") if you find text then do nothing...

当我运行的正则表达式匹配我的整个字符串虽然。我问学习的目的这个问题。我知道，我可以删除所有字符串然后寻找我需要的东西。

when I run that regex I match the whole string though. I am asking this question for purposes of learning. I know I can remove all strings then look for what I need.

推荐答案

下面是一个答案：

(?<=^([^"]|"[^"]*")*)text

这意味着：

(?<=       # preceded by...
^          # the start of the string, then
([^"]      # either not a quote character
|"[^"]*"   # or a full string
)*         # as many times as you want
)
text       # then the text

您可以轻松地扩展这个处理含逃逸以及字符串

You can easily extend this to handle strings containing escapes as well.

在C＃代码：

Regex.Match("bla bla bla \"this text is inside a string\"",
            "(?<=^([^\"]|\"[^\"]*\")*)text", RegexOptions.ExplicitCapture);

添加了从评论的讨论 - 扩展版（比赛在每行的基础和处理逃逸）。使用 RegexOptions.Multiline 此：

Added from comment discussion - extended version (match on a per-line basis and handle escapes). Use RegexOptions.Multiline for this:

(?<=^([^"\r\n]|"([^"\\\r\n]|\\.)*")*)text

在一个C＃字符串，这看起来像：

In a C# string this looks like:

"(?<=^([^\"\r\n]|\"([^\"\\\\\r\n]|\\\\.)*\")*)text"

既然你现在想使用 ** 而不是这里是一个版本：

Since you now want to use ** instead of " here is a version for that:

(?<=^([^*\r\n]|\*(?!\*)|\*\*([^*\\\r\n]|\\.|\*(?!\*))*\*\*)*)text

说明：

(?<=       # preceded by
^          # start of line
 (         # either
 [^*\r\n]| #  not a star or line break
 \*(?!\*)| #  or a single star (star not followed by another star)
  \*\*     #  or 2 stars, followed by...
   ([^*\\\r\n] # either: not a star or a backslash or a linebreak
   |\\.        # or an escaped char
   |\*(?!\*)   # or a single star
   )*          # as many times as you want
  \*\*     # ended with 2 stars
 )*        # as many times as you want
)
text      # then the text

由于此版本不包含字符，它的清洁剂使用一个字符串：

Since this version doesn't contain " characters it's cleaner to use a literal string:

@"(?<=^([^*\r\n]|\*(?!\*)|\*\*([^*\\\r\n]|\\.|\*(?!\*))*\*\*)*)text"

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