A regular expression with two numbered groups. : Group « Regular Expressions « VB.Net Tutorial

1. VB.Net Tutorial
2. Regular Expressions
3. Group

'The first group captures one or more consecutive digits. 
'The second group matches a single character. 

Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim pattern As String = "(\d+)*(\w)\2"
      Dim input As String = "AA"
      Dim match As Match = Regex.Match(input, pattern)

      Dim group1 As Group = match.Groups.Item(1)
      Console.WriteLine("Group 1 value: {0}", If(group1.Success, group1.Value, "Empty"))

      Dim group2 As Group = match.Groups.Item(2)
      Console.WriteLine("Group 2 value: {0}", If(group2.Success, group2.Value, "Empty"))

   End Sub
End Module