Strings: Replace a character with another within one string

(Q) How do I replace a character with another one within a string?

(A) This function can boost perfomance on typical find-and-replace operations in which the string being searched is large, and the string being sought only occurs in a few locations.

 ''************ Code Start **********
'This code was originally written by Alden Streeter.
'It is not to be altered or distributed,
'except as part of an application.
'You are free to use it in any application,
'provided the copyright notice is left unchanged.
'
'Code Courtesy of
'Alden Streeter
'
Function FindAndReplace(ByVal strInString As String, _
        strFindString As String, _
        strReplaceString As String) As String
Dim intPtr As Integer
    If Len(strFindString) > 0 Then  'catch if try to find empty string
        Do
            intPtr = InStr(strInString, strFindString)
            If intPtr > 0 Then
                FindAndReplace = FindAndReplace & left(strInString, intPtr - 1) & _
                                        strReplaceString
                    strInString = Mid(strInString, intPtr + Len(strFindString))
            End If
        Loop While intPtr > 0
    End If
    FindAndReplace = FindAndReplace & strInString
End Function
'************ Code End **********