^: Begin the match at the beginning of the input string.

   

Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim pattern As String = "^\D\d{1,5}\D*$" 
      Dim inputs() As String = { "A1a1039C", "AaaaaA0001", "C111118A", "Y11111111" } 

      For Each input As String In inputs
         If Regex.IsMatch(input, pattern) Then
            Console.WriteLine(input + ": matched")
         Else
            Console.WriteLine(input + ": match failed")
         End If   
      Next
   End Sub
End Module

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^: Begin the match at the beginning of the input string. : Regular Expressions « Development « VB.Net

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