using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:\d*?(9)|\d*?(8)|\d*?(7)|\d*?(6)|\d*?(5)|\d*?(4)|\d*?(3)|\d*(2)|\d*(1))(?:\d*(9)|\d*(8)|\d*(7)|\d*(6)|\d*(5)|\d*(4)|\d*(3)|\d*(2)|\d*(1))";
string input = @"987654321111111
811111111111119
234234234234278
818181911112111";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
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