Regex Class represents an immutable regular expression.

 

Imports System
Imports System.IO
Imports System.Text.RegularExpressions

Module Test

    Public Sub Main()

        Dim sr As New StreamReader("c:\\a.txt")
        Dim input As String
        Dim pattern As String = "\b(\w+)\s\1\b"
        Do While sr.Peek() >= 0
            input = sr.ReadLine()
            Dim rgx As New Regex(pattern, RegexOptions.IgnoreCase)
            Dim matches As MatchCollection = rgx.Matches(input)
            If matches.Count > 0 Then
                Console.WriteLine("{0} ({1} matches):", input, matches.Count)
                For Each match As Match In matches
                    Console.WriteLine("   " + match.Value)
                Next
            End If
        Loop
        sr.Close()
    End Sub
End Module

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Regex Class represents an immutable regular expression. : Regular Expressions « Development « VB.Net

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