Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

  Dim streamf As New System.IO.StreamReader("C:UsersZan and PolDesktopMinecraftMinecraftbinReleaseconfig.txt")
  Dim derp As String = streamf.ReadToEnd

  Dim r As New Regex("Mappath = .*")

  Dim randomstring As String = "Mappath = willitwork.ini"

  Dim mappath As MatchCollection = r.Matches(randomstring) ' When changed to derp doesn't work. Derp does work when you put it in a message box too. I tried .tostring.)
  Dim dherp(1) As String

  For Each mappaths As Match In mappath

    dherp = mappaths.ToString().Split("= ")
    MsgBox(dherp(1))
  Next

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

Public class example
    Public shared sub Main()

         Dim sb As StringBuilder = new StringBuilder()
         sb.AppendLine( "leading junk" )
         sb.AppendLine( "Mappath = willitwork.ini" )
         sb.AppendLine( "Mappath = works.ini" )
         sb.AppendLine( "trailing junk" )

         Dim ms As MemoryStream  = New MemoryStream()
         ms.Write(System.Text.Encoding.UTF8.GetBytes(sb.ToString()), 0, sb.tostring().length)
         ms.Seek(0, SeekOrigin.Begin)

         Dim streamf As StreamReader = New StreamReader(ms)
         Dim derp As String
         derp = streamf.ReadToEnd

         Dim r As New Regex("Mappath = .*")
         Dim randomstring As String = sb.tostring()

         Dim mappath As MatchCollection = r.Matches(derp)
         Dim dherp(1) As String

         For Each mappaths As Match In mappath
             dherp = mappaths.ToString().Split("= ")
             Console.WriteLine(dherp(1))
         Next
    End Sub

End class