VB - Some functions that makes string parsing easier

The next functions makes string parsing a “piece of cake”.

The first word in the function names, is how the function does the search (ie Left = Instr and Right = InStrRev), and the right word of the function is what part of the string the function returns...

These functions makes string parsing easier because it returns the result as a string instead of the string position.

And one last thing to mention: the functions do NOT include the string to search in the result.

Copy and paste the code into a module ( .bas ) file

Code:

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Option Explicit

Public Enum IfStringNotFound
    ReturnOriginalStr = 0
    ReturnEmptyStr = 1
End Enum

' Search from end to beginning, and return the left side of the string
Public Function RightLeft(ByRef Str As String, RFind As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long
   
    K = InStrRev(Str, RFind, , Compare)
   
    If K = 0 Then
        RightLeft = IIf(RetError = ReturnOriginalStr, Str, "")
    Else
        RightLeft = Left(Str, K - 1)
    End If
End Function

' Search from end to beginning and return the right side of the string
Public Function RightRight(ByRef Str As String, RFind As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long
   
    K = InStrRev(Str, RFind, , Compare)
   
    If K = 0 Then
        RightRight = IIf(RetError = ReturnOriginalStr, Str, "")
    Else
        RightRight = Mid(Str, K + 1, Len(Str))
    End If
End Function

' Search from the beginning to end and return the left side of the string
Public Function LeftLeft(ByRef Str As String, LFind As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long
   
    K = InStr(1, Str, LFind, Compare)
    If K = 0 Then
        LeftLeft = IIf(RetError = ReturnOriginalStr, Str, "")
    Else
        LeftLeft = Left(Str, K - 1)
    End If
End Function

' Search from the beginning to end and return the right side of the string
Public Function LeftRight(ByRef Str As String, LFind As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long
   
    K = InStr(1, Str, LFind, Compare)
    If K = 0 Then
        LeftRight = IIf(RetError = ReturnOriginalStr, Str, "")
    Else
        LeftRight = Right(Str, (Len(Str) - Len(LFind)) - K + 1)
    End If
End Function

' Search from the beginning to end and return from StrFrom string to StrTo string
' both strings (StrFrom and StrTo) must be found in order to be successfull
Public Function LeftRange(ByRef Str As String, StrFrom As String, StrTo As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long, Q As Long
   
    K = InStr(1, Str, StrFrom, Compare)
    If K > 0 Then
        Q = InStr(K + Len(StrFrom), Str, StrTo, Compare)
       
        If Q > K Then
            LeftRange = Mid(Str, K + Len(StrFrom), (Q - K) - Len(StrFrom))
        Else
            LeftRange = IIf(RetError = ReturnOriginalStr, Str, "")
        End If
    Else
        LeftRange = IIf(RetError = ReturnOriginalStr, Str, "")
    End If
End Function

' Search from the end to beginning and return from StrFrom string to StrTo string
' both strings (StrFrom and StrTo) must be found in order to be successfull
Public Function RightRange(ByRef Str As String, StrFrom As String, StrTo As String, Optional Compare As VbCompareMethod = vbBinaryCompare, Optional RetError As IfStringNotFound = ReturnOriginalStr) As String
    Dim K As Long, Q As Long
   
    K = InStrRev(Str, StrTo, , Compare)
    If K > 0 Then
        Q = InStrRev(Str, StrFrom, K, Compare)
       
        If Q > 0 Then
            RightRange = Mid(Str, Q + Len(StrFrom), (K - Q) - Len(StrTo))
        Else
            RightRange = IIf(RetError = ReturnOriginalStr, Str, "")
        End If
    Else
        RightRange = IIf(RetError = ReturnOriginalStr, Str, "")
    End If
End Function

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