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Class: FuzzyStringSearch in Category General VBA/VB6 : Searching and Sorting from Total Visual SourceBook

Approximate text matching using fuzzy string searching in VBA and VB6.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CFuzzyStringSearch class.
CaseSensitive	Property	Determine whether or not the search is case sensitive. This property must be set before the FindText and Text properties.
FindText	Property	Get the search text.
MaxCharacterDifference	Property	Get the maximum number of different characters allowed for a match.
Text	Property	Get the text that is being searched.
Class_Initialize	Initialize	Set initial values to defaults which may be overridden with property settings.
FindNext	Method	Finds the next matching string. This function increments the index into the search buffer each time it is called. To begin searching from the beginning of the search buffer, call the Reset method.
Reset	Method	Reset the search.

Example Code for Using Class: FuzzyStringSearch

' Example of CFuzzyStringSearch
'
' To use this example, create a new module and paste this code into it.
' Then run the procedure by putting the cursor in the procedure and pressing:
'    F5 to run it, or
'    F8 to step through it line-by-line (see the Debug menu for more options)

Public Sub Example_CFuzzyStringSearch()
  ' Comments: Example of using class CFuzzyStringSearch to perform fuzzy string searching in VBA and VB6.
  '           See the results in the Immediate Window.

  Const cstrText As String = "Apples apricots bananas blueberries cherries kiwi peaches pears pineapples raspberries strawberries"
  Dim clsFuzzyStringSearch As CFuzzyStringSearch
  Dim lngFindStart As Long
  Dim lngFindLength As Long
  Dim intDifferences As Integer
  Dim intLoop As Integer
  Dim strFind As String

  Set clsFuzzyStringSearch = New CFuzzyStringSearch

  With clsFuzzyStringSearch
    ' Set whether it's case sensitive or insensitive searching before loading the text
    .CaseSensitive = True
    .MaxCharacterDifference = 1

    ' Text to be searched
    .Text = cstrText

    ' Search for a different term in each loop
    For intLoop = 1 To 4
      ' Text to find
      Select Case intLoop
        Case 1
          strFind = "apples"
        Case 2
          strFind = "apple"
        Case 3
          strFind = "aple"
        Case 4
          strFind = "berry"
      End Select

      .FindText = strFind

      ' Keep searching the string for each occurrence
      Debug.Print "Search for: " & strFind
      Do While .FindNext(lngFindStart, lngFindLength, intDifferences)
        ' Show the character where it's found and the number of character differences
        Debug.Print lngFindStart, intDifferences, Mid$(cstrText, lngFindStart, lngFindLength)
      Loop
      Debug.Print

      ' Reset for next search so it starts from the beginning
      .Reset
    Next intLoop
  End With

  Set clsFuzzyStringSearch = Nothing

End Sub

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