using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^([a-z])(?!\1)([a-z])(?!\1|\2)[a-z](?:1[5-9][0-9]{2}|20[01][0-9]|2020)[0-9]{2,4}[0-9]$";
string input = @"abc1500999
abc15009999
abc150099999
abc202099999
bbc202099999
baa202099999";
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