VBA implementation of metaphone algorithm

[neeraj_chow]

Are there any VBA implementation of the METAPHONE algorithm for phonetic comparison.
Earlier I used SOUNDEX but was founding it too loose, but I have since learned that this metaphone is better one and another version of it the Double Metaphone is still better.

Any help will be appreciated.

 

[Joe Was]

I only have this Soundex code:


Function SOUNDEX(Surname As String) As String
' The Custom Function "SOUNDEX" used in this macro was Developed by Richard J. Yanco.
' This function follows the Soundex rules given at
' http://home.utah-inter.net/kinsearch/Soundex.html
' The VB Application "Soundex_Codes; By: Joe Was & John Walkenbach.

Dim Result As String, c As String * 1
Dim Location As Integer

Surname = UCase(Surname)

' First character must be a letter
If Asc(Left(Surname, 1)) < 65 Or Asc(Left(Surname, 1)) > 90 Then
SOUNDEX = ""
Exit Function
Else
' St. is converted to Saint
If Left(Surname, 3) = "ST." Then
Surname = "SAINT" & Mid(Surname, 4)
End If

' 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(Surname, 1)
For Location = 2 To Len(Surname)
Result = Result & Category(Mid(Surname, 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
Select Case Len(Result)
Case 4
SOUNDEX = Result
Case Is < 4
SOUNDEX = Result & String(4 - Len(Result), "0")
Case Is > 4
SOUNDEX = Left(Result, 4)
End Select
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 H and W, spaces, punctuation, etc.
Category = ""
End Select
End Function

 

[JimmyG]

VBA implementation of double metaphone

.... has anyone since implemented Double-Metaphone as a UDF?

Soundex isn't very suitable!


:: Double Metaphone to get similar RESULTS
(then fuzzy percent to compare/rank against the search string)


JimmyG