C# Regex Match between with or without new lines

Question

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

Code

Answer 1

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)\[%(.*?)%]

Note that (?s)\[%(.*?)%] will match even if the % is inside [%...%].

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 ].

In C#, you can use

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

Answer 2

Try this pattern:

\[%([^%]*)%\]

It captures all characters between "[%" and "%]" that is not a "%" character.

Tested @ Regex101

If you want to "see" the "\r\n" in your results, you'll have to escape them with a String.Replace().

See Fiddle Demo