Disabling specific input with Chat plugin

Function OnPluginChatMessage (id, message, sText)
Dim regEx, Matches, Match, FixedText
Dim ScriptPrefix, ScriptEnabled
Dim CommandStackCharacter, CommandStackEnabled

  OnPluginChatMessage = vbTrue  ' process it


'
'  Example of rejecting a message:
'
'  if message = 26 then OnPluginChatMessage = vbFalse ' ignore pings
'

'
'  Example of filtering commands
'
   if message = 105 then  ' command from chat connection

'
'  Find their script prefix and command stack character
'
   ScriptPrefix  = world.GetAlphaOption ("script_prefix")
   ScriptEnabled = world.GetOption ("enable_scripts")
   CommandStackCharacter = world.GetAlphaOption ("command_stack_character")
   CommandStackEnabled = world.GetOption ("enable_command_stack")

   FixedText = Trim (sText)   ' remove spaces

'
'  Disable command stacking
'
   If CommandStackEnabled And _
      InStr (FixedText, CommandStackCharacter) > 0 Then
     ColourNote "white", "red", _
        "Command stacking received via chat - discarded"
     ColourNote "white", "red", _
        "Line was: " & FixedText 
     OnPluginChatMessage = vbFalse
     Exit Function
   End If
     
'
'  Disable script commands
'
   If ScriptEnabled And ScriptPrefix <> "" And _
      Left (FixedText, Len (ScriptPrefix)) = ScriptPrefix Then
     ColourNote "white", "red", _
        "Script command received via chat - discarded"
     ColourNote "white", "red", _
        "Line was: " & FixedText 
     OnPluginChatMessage = vbFalse
     Exit Function
   End If

   Set regEx = New RegExp

'
'  Disallow:  change password
'             read mail
'             delete character
'
'  You can add others of your own. The \s+ means "one or more spaces"
'    This stops people typing "read   mail" and getting through the filter
'
   regEx.Pattern = "^(change\s+password)|(read\s+mail)|(delete\s+character)"

'
'  Execute regular expression
'

   Set Matches = regEx.Execute (lcase (FixedText))

'
'  Exit if no match
'
   if Matches.Count = 0 then  
     Set regEx = Nothing
     Set Matches = Nothing
     Exit Function
   end if

   Set Match = Matches.Item (0)
 
'
'  wildcards in the regexp can be accessed here, eg.
'    Match.SubMatches (0) is the first wildcard
'    Match.SubMatches (1) is the second wildcard, and so on
'
   Set regEx = Nothing
   Set Matches = Nothing

'
'  Matched - ignore this command
'
   ColourNote "white", "red", _
      "Illegal command received via chat - discarded"
   ColourNote "white", "red", _
      "Line was: " & FixedText 
   OnPluginChatMessage = vbFalse
   Exit Function

   end if  ' type 105 (command)

End Function