using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\b[a|b]{2}a[a|b]*b[a|b]{4}\b|\b[a|b]ba[a|b][a|b]{2}\b|\bb[a|b]{1}a[a|b]{2}\b";
string input = @"aaabaaaa abaaaa baaaa aabaaaa aaaaaaba";
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