using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\{\\rtf1\\ansi\\ansicpg1252(?:.|[\r\n]+)*\{\\\*\\listtable";
string input = @"{\rtf1\ansi\ansicpg1252
\deff0{\fonttbl{\f0\froman\fcharset0 Times New Roman;}{\f1\froman\fcharset0 HELVETICA;}{\f2\froman\fcharset0 Arial;}{\f3\froman\fcharset0 unknown;}{\f4\froman\fcharset0 HELVETICA-BOLD;}{\f5\froman\fcharset0 Helvetica;}}
{\colortbl\red0\green0\blue0;\red255\green255\blue255;\red244\green245\blue255;\red254\green182\blue230;\red0\green0\blue255;}
{\stylesheet
{\style\s0 \ql\fi0\li0\ri0\f2\fs24\cf0 Normal;}
{\style\s3 \ql\fi0\li0\ri0\f2\fs26\b\cf0 heading 3;}
{\style\s2 \ql\fi0\li0\ri0\f2\fs28\b\i\cf0 heading 2;}
{\style\s1 \ql\fi0\li0\ri0\f2\fs32\b\cf0 heading 1;}
}
{\*\listtable
{\style\s0 \ql\fi0\li0\ri0\f2\fs24\cf0 Normal;}
{\style\s3 \ql\fi0\li0\ri0\f2\fs26\b\cf0 heading 3;}
{\style\s2 \ql\fi0\li0\ri0\f2\fs28\b\i\cf0 heading 2;}
{\style\s1 \ql\fi0\li0\ri0\f2\fs32\b\cf0 heading 1;}
}
{\*\listtable
}
{\*\listoverridetable
}
{\*\generator iText 2.1.2 (by lowagie.com)}
{\info}";
foreach (Match m in Regex.Matches(input, pattern))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx