AW: unscharfe stringsuche/vergleich
21.03.2005 12:13:47
PeterP
Ich habe etwas gefunden, was ich euch nicht vorenthalten möchte, denn das ergebnis ist (zumindest für meine zwecke) perfekt:
Function FuzzyMatchByWord(ByVal lsPhrase1 As String, ByVal lsPhrase2 As String, Optional lbStripVowels As Boolean = False, Optional lbDiscardExtra As Boolean = False) As Double
' Compare two phrases and return a similarity value (between 0 and 100).
' Arguments:
' 1. Phrase1 String; any text string
' 2. Phrase2 String; any text string
' 3. StripVowels Optional to strip all vowels from the phrases
' 4. DiscardExtra Optional to discard any unmatched words
'local variables
Dim lsWord1() As String
Dim lsWord2() As String
Dim ldMatch() As Double
Dim ldCur As Double
Dim ldMax As Double
Dim liCnt1 As Integer
Dim liCnt2 As Integer
Dim liCnt3 As Integer
Dim lbMatched() As Boolean
Dim lsNew As String
Dim lsChr As String
Dim lsKeep As String
'set default value as failure
FuzzyMatchByWord = 0
'create list of characters to keep
lsKeep = "BCDFGHJKLMNPQRSTVWXYZ0123456789 "
If Not lbStripVowels Then
lsKeep = lsKeep & "AEIOU"
End If
'clean up phrases by stripping undesired characters
'phrase1
lsPhrase1 = Trim$(UCase$(lsPhrase1))
lsNew = ""
For liCnt1 = 1 To Len(lsPhrase1)
lsChr = Mid$(lsPhrase1, liCnt1, 1)
If InStr(lsKeep, lsChr) <> 0 Then
lsNew = lsNew & lsChr
End If
Next
lsPhrase1 = lsNew
lsPhrase1 = Replace(lsPhrase1, " ", " ")
lsWord1 = Split(lsPhrase1, " ")
If UBound(lsWord1) = -1 Then
Exit Function
End If
ReDim ldMatch(UBound(lsWord1))
'phrase2
lsPhrase2 = Trim$(UCase$(lsPhrase2))
lsNew = ""
For liCnt1 = 1 To Len(lsPhrase2)
lsChr = Mid$(lsPhrase2, liCnt1, 1)
If InStr(lsKeep, lsChr) <> 0 Then
lsNew = lsNew & lsChr
End If
Next
lsPhrase2 = lsNew
lsPhrase2 = Replace(lsPhrase2, " ", " ")
lsWord2 = Split(lsPhrase2, " ")
If UBound(lsWord2) = -1 Then
Exit Function
End If
ReDim lbMatched(UBound(lsWord2))
'exit if empty
If Trim$(lsPhrase1) = "" Or Trim$(lsPhrase2) = "" Then
Exit Function
End If
'compare words in each phrase
For liCnt1 = 0 To UBound(lsWord1)
ldMax = 0
For liCnt2 = 0 To UBound(lsWord2)
If Not lbMatched(liCnt2) Then
ldCur = FuzzyMatch(lsWord1(liCnt1), lsWord2(liCnt2))
If ldCur > ldMax Then
liCnt3 = liCnt2
ldMax = ldCur
End If
End If
Next
lbMatched(liCnt3) = True
ldMatch(liCnt1) = ldMax
Next
'discard extra words
ldMax = 0
For liCnt1 = 0 To UBound(ldMatch)
ldMax = ldMax + ldMatch(liCnt1)
Next
If lbDiscardExtra Then
liCnt2 = 0
For liCnt1 = 0 To UBound(lbMatched)
If lbMatched(liCnt1) Then
liCnt2 = liCnt2 + 1
End If
Next
Else
liCnt2 = UBound(lsWord2) + 1
End If
'return overall similarity
FuzzyMatchByWord = 100 * (ldMax / liCnt2)
End Function
Function FuzzyMatch(Fstr As String, Sstr As String) As Double
' Code sourced from: <a href="http://www.mrexcel.com/pc07.shtml">http://www.mrexcel.com/pc07.shtml</a>
' Credited to: Ed Acosta
' Modified: Joe Stanton
Dim L, L1, L2, M, SC, T, R As Integer
L = 0
M = 0
SC = 1
L1 = Len(Fstr)
L2 = Len(Sstr)
Do While L < L1
L = L + 1
For T = SC To L1
If Mid$(Sstr, L, 1) = Mid$(Fstr, T, 1) Then
M = M + 1
SC = T
T = L1 + 1
End If
Next T
Loop
If L1 = 0 Then
FuzzyMatch = 0
Else
FuzzyMatch = M / L1
End If
End Function
quelle: http://www.mrexcel.com/pc07.shtml
gruß
peter