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

Class that implements Boyer-Moore string searching using VBA and VB6.

The Boyer-Moore string-searching algorithm provides a highly optimized method for searching for a sub-string within a string. The Boyer-Moore algorithm takes advantage of its knowledge of the string being searched for. By doing this, it is possible to search a string without examining all the characters in the string.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CBoyerMoore 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 text to search for.
Text	Property	Get the value of the text being searched.
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.
ResetSearch	Method	Reset the search.

Example Code for Using Class: BoyerMoore

' Example of CBoyerMoore
'
' 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)

Private Sub Example_CBoyerMoore()
  ' Comments: Example of using the CBoyerMoore class in VBA or VB6.
  '           The Boyer-Moore string-searching algorithm provides a highly optimized method for searching for a sub-string within a string.
  '           The Boyer-Moore algorithm takes advantage of its knowledge of the string being searched for.
  '           By doing this, it is possible to search a string without examining all the characters in the string.

  Dim lngFindStart As Long
  Dim lngFindLength As Long
  Dim clsBoyerMoore As CBoyerMoore

  Set clsBoyerMoore = New CBoyerMoore

  clsBoyerMoore.CaseSensitive = True
  clsBoyerMoore.FindText = "Hello"
  clsBoyerMoore.Text = "Hello World"
  clsBoyerMoore.ResetSearch

  Do While clsBoyerMoore.FindNext(lngFindStart, lngFindLength)
    Debug.Print "'" & Mid$("Hello World", lngFindStart, lngFindLength) & "' was found in string at position " & lngFindStart
  Loop

End Sub

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