C#正则表达式之间是否有换行符匹配 [英] C# Regex Match between with or without new lines

问题描述

我正在尝试在两个定界符 [％％] 之间匹配文本，并且无论字符串是否包含新行，我都想获取所有内容.

I am trying to match text between two delimiters, [% %], and I want to get everything whether the string contains new lines or not.

代码

string strEmailContent = sr.ReadToEnd();
string commentPatt = @"\[%((\r\n?|\n).*(\r\n?|\n))%\]";
Regex commentRgx = new Regex(commentPatt, RegexOptions.Singleline);

示例输入

//Successful
[%
  New Comment
%] other content from input

//Match: [%\r\nNew Comment\r\n%]

//Fail
[% New Comment %]

//Match: false

//Successfully match single line with
string commentPatt = @"\[%(.*)%\]";

//Match: [% New Comment %]

我不知道如何组合这两种模式以匹配两种情况.任何人都可以提供帮助吗?

I do not know how to combine these two patterns to match both cases. Can anyone provide any assistance?

推荐答案

要在两个定界符之间获取文本，您需要将惰性匹配与.*?一起使用，但要还匹配换行符号，您需要(?s)单行修饰符，以便点也可以匹配换行符号:

To get text between two delimiters you need to use lazy matching with .*?, but to also match newline symbols, you need (?s) singleline modifier so that the dot could also match newline symbols:

(?s)\[%(.*?)%]

请注意，即使％位于 [％...％] .

请参见正则表达式演示.请注意，] 不必转义，因为它位于明确的位置，并且只能解释为原义的] .

See regex demo. Note that the ] does not have to be escaped since it is situated in an unambiguous position and can only be interpreted as a literal ].

在C#中，您可以使用

var rx = new Regex(@"(?s)\[%(.*?)%]");
var res = rx.Matches(str).Cast<Match>().Select(p => p.Groups[1].Value).ToList();

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