Replacing strings using regular expressions in multiple files in


I'm looking to build a simple text string replacement tool using visual studio 2015 community tool, which will do the below replacements on all *.txt files whose path is given in a textbox:

Replace: figure \1

Replace: table \1
Replace: section \1
I have coded the programme but struggling to successfully run it. I'm completely new in programming and in visual basic is well. Can anyone help complete this programme

Imports System.IO
Imports System.Text.RegularExpressions
Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If FBD.ShowDialog = DialogResult.OK Then
            TextBox1.Text = FBD.SelectedPath
        End If
    End Sub
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Dim targetDirectory As String
        targetDirectory = TextBox1.Text
        Dim Files As String() = Directory.GetFiles(targetDirectory, "*.txt")
        Dim pattern1 As String = "\<figure (\d+)\>"
        Dim pattern2 As String = "\<table (\d+)\>"
        Dim pattern3 As String = "\<section (\d+)\>"
        Dim rep1 As String = "<a href id= \""fig\1\"" > figure \1</a>"
        Dim rep2 As String = "<a href id= \""tab\1\"" > table \1</a>"
        Dim rep3 As String = "<a href id= \""sec\1\"" > section \1</a>"
        Dim rgx1 As New Regex(pattern1)
        Dim rgx2 As New Regex(pattern2)
        Dim rgx3 As New Regex(pattern3)
        Dim result1 As String = rgx1.Replace(Files, rep1)
        Dim result2 As String = rgx2.Replace(Files, rep2)
        Dim result3 As String = rgx3.Replace(Files, rep3)
    End Sub
End Class


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