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using System;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var value =
				"super exemple of string key : text I want to keep - end of my string"
					.Between(
				        "key : ",
				        " - ");
 
		Console.WriteLine(value);
	}
}
 
public static class Ext
{
	static string Between(this System.String source, string left, string right)
	{
		return Regex.Match(
				source,
				string.Format("{0}(.*){1}", left, right))
			.Groups[1].Value;
	}
}

prog.cs(10,7): error CS1061: Type `string' does not contain a definition for `Between' and no extension method `Between' of type `string' could be found. Are you missing an assembly reference?
/usr/lib/mono/4.5/mscorlib.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty