The metaphone algorithm is similar to the Soundex algorithm but tends to group names together that are more closely related than Soundex does. However, metaphone also tends to produce more matches than Soundex. Similar to Soundex, the metaphone algorithm generates a key value for a word based on the consonants in that word. Metaphone uses more intelligent transformation rules, though, by examining groups of letters, or diphthongs.
|(Declarations)||Declarations||Declarations and private variables for the CMetaPhone class.|
|Class_Initialize||Initialize||Set initial values to defaults which may be overridden with property settings.|
|Metaphone||Method||Calculates the metaphone value of a word.|
|AffectH||Private||Determine if the character affects "H". The following characters affect "H": C,G,P,S,T.|
|IntToByte||Private||Perform an unsigned conversion from an integer value to a byte value. This procedure correctly handles any integer value. For example, lngNumber = -1 assigns -1 to the variable lngNumber. However, lngNumber = IntToLong(-1) assigns 65,535 to lngNumber.|
|IsLetter||Private||Determine if a character is a letter.|
|IsVowel||Private||Determine if the character is a vowel.|
|MakeSoft||Private||Determine if the character should be made soft. The following letters are made soft: E, I, Y.|
|NoChange||Private||Determine if the character should be changed. The following characters are not transformed by the MetaPhone algorithm: F, J, L, M, N, R.|
|NoGHToF||Private||Determine if "GH" should be changed to "F". G is transformed to F if it is proceeded by H, and the word does not start with B, D, or H.|
' Example of CMetaphone ' ' To try this example, do the following: ' 1. Create a new form ' 2. Create a command button named 'cmdTest' ' 3. Paste all the code from this example to the new form's module. ' 4. Run the form Private Sub cmdTest_Click() Dim Metaphone As CMetaPhone Dim strKeyOne As String Dim strKeyTwo As String Set Metaphone = New CMetaPhone ' Calculate and compare keys strKeyOne = Metaphone.Metaphone("Microsoft") strKeyTwo = Metaphone.Metaphone("Mikrosopht") If strKeyOne = strKeyTwo Then Debug.Print "They match!" Else Debug.Print "They do not match" End If End Sub
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