tricky (I think,lol) match and fill in

Option Explicit
Function Soundex(InputStr As String) As String
' Based on function developed by Richard J. Yanco
' This function follows the Soundex rules given at
' http://home.utah-inter.net/kinsearch/Soundex.html
    Dim Result As String, c As String * 1
    Dim Location As Long
    InputStr = UCase(InputStr)
'   First character must be a letter
    If Asc(Left(InputStr, 1)) < 65 Or Asc(Left(InputStr, 1)) > 90 Then
        Soundex = ""
        Exit Function
    Else
'       Convert to Soundex: letters to their appropriate digit,
'                     A,E,I,O,U,Y ("slash letters") to slashes
'                     H,W, and everything else to zero-length string
        Result = Left(InputStr, 1)
        For Location = 2 To Len(InputStr)
            Result = Result & Category(Mid(InputStr, Location, 1))
        Next Location
      
'       Remove double letters
        Location = 2
        Do While Location < Len(Result)
            If Mid(Result, Location, 1) = Mid(Result, Location + 1, 1) Then
                Result = Left(Result, Location) & Mid(Result, Location + 2)
            Else
                Location = Location + 1
            End If
        Loop
    
'       If category of 1st letter equals 2nd character, remove 2nd character
        If Category(Left(Result, 1)) = Mid(Result, 2, 1) Then
            Result = Left(Result, 1) & Mid(Result, 3)
        End If
    
'       Remove slashes
        For Location = 2 To Len(Result)
            If Mid(Result, Location, 1) = "/" Then
                Result = Left(Result, Location - 1) & Mid(Result, Location + 1)
            End If
        Next
    
'       Trim or pad with zeroes as necessary
        Soundex = Left(Result & "0000", 4)
    End If
End Function
Private Function Category(c) As String
'   Returns a Soundex code for a letter
    Select Case True
        Case c Like "[AEIOUY]"
            Category = "/"
        Case c Like "[BPFV]"
            Category = "1"
        Case c Like "[CSKGJQXZ]"
            Category = "2"
        Case c Like "[DT]"
            Category = "3"
        Case c = "L"
            Category = "4"
        Case c Like "[MN]"
            Category = "5"
        Case c = "R"
            Category = "6"
        Case Else 'This includes vowels, Y, H and W, spaces, punctuation, etc.
            Category = ""
    End Select
End Function
Function RegExpFind(LookIn As String, PatternStr As String, Optional Pos, _
    Optional MatchCase As Boolean = True)
    
    
    ' This function uses Regular Expressions to parse a string (LookIn), and return matches to a
    ' pattern (PatternStr).  Use Pos to indicate which match you want:
    ' Pos omitted               : function returns a zero-based array of all matches
    ' Pos = 0                   : the last match
    ' Pos = 1                   : the first match
    ' Pos = 2                   : the second match
    ' Pos = <positive integer>  : the Nth match
    ' If Pos is greater than the number of matches, is negative, or is non-numeric, the function
    ' returns an empty string.  If no match is found, the function returns an empty string
    
    ' If MatchCase is omitted or True (default for RegExp) then the Pattern must match case (and
    ' thus you may have to use [a-zA-Z] instead of just [a-z] or [A-Z]).
    
    ' If you use this function in Excel, you can use range references for any of the arguments.
    ' If you use this in Excel and return the full array, make sure to set up the formula as an
    ' array formula.  If you need the array formula to go down a column, use TRANSPOSE()
    
    Dim RegX As Object
    Dim TheMatches As Object
    Dim Answer() As String
    Dim Counter As Long
    
    ' Evaluate Pos.  If it is there, it must be numeric and converted to Long
    If Not IsMissing(Pos) Then
        If Not IsNumeric(Pos) Then
            RegExpFind = ""
            Exit Function
        Else
            Pos = CLng(Pos)
        End If
    End If
    
    ' Create instance of RegExp object
    Set RegX = CreateObject("VBScript.RegExp")
    With RegX
        .Pattern = PatternStr
        .Global = True
        .IgnoreCase = Not MatchCase
    End With
        
    ' Test to see if there are any matches
    If RegX.test(LookIn) Then
        
        ' Run RegExp to get the matches, which are returned as a zero-based collection
        Set TheMatches = RegX.Execute(LookIn)
        
        ' If Pos is missing, user wants array of all matches.  Build it and assign it as the
        ' function's return value
        If IsMissing(Pos) Then
            ReDim Answer(0 To TheMatches.Count - 1) As String
            For Counter = 0 To UBound(Answer)
                Answer(Counter) = TheMatches(Counter)
            Next
            RegExpFind = Answer
        
        ' User wanted the Nth match (or last match, if Pos = 0).  Get the Nth value, if possible
        Else
            Select Case Pos
                Case 0                          ' Last match
                    RegExpFind = TheMatches(TheMatches.Count - 1)
                Case 1 To TheMatches.Count      ' Nth match
                    RegExpFind = TheMatches(Pos - 1)
                Case Else                       ' Invalid item number
                    RegExpFind = ""
            End Select
        End If
    
    ' If there are no matches, return empty string
    Else
        RegExpFind = ""
    End If
    
    ' Release object variables
    Set RegX = Nothing
    Set TheMatches = Nothing
    
End Function

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