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C# alternative to VBScript InStrRev function

Posted on 2004-10-13
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Last Modified: 2012-08-13
I need to search a string for multiple occurences of numbers separated by a hyphen (-).  A typical example would be the string "seahorse_se-120-181-3794-pr", where I need the last two sets of digits - the 181 and the 3794.  These numbes are not a fixed number of digits - they can be from 1 to 4 digits in length; and because nothing is ever easy, the string in front of the numbers (the "seahorse_se-120-" in the example above) can be any length also.  I am using VBScript in an ASP page right now, and the InStrRev function works fine to help me extract what I need.  Is there a C# equivalent?

Thanks for your help,

Rod
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Question by:okanagan
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3 Comments
 
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Expert Comment

by:flavo
ID: 12303190
My C# isnt the best, but i have a VBA version of it, tried to convert it the VB .Net (dont have it at hand so cant test)

Dave

Public Function InStrRev(StringCheck As String, StringMatch As String, Optional Start As Long = -1)

    Dim sTemp As String

    If Start <= 0 Then
        sTemp = StringCheck
    Else
        sTemp = Left(StringCheck, Start)
    End If
   
    Do Until sTemp = ""
        If Mid(StringCheck, Len(sTemp), Len(StringMatch)) = StringMatch Then
            Exit Do
        End If
        sTemp = Left(sTemp, Len(sTemp) - 1)
    Loop
    If sTemp = "" Then
        return 0
    Else
        return Len(sTemp)
    End If

End Function
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AvonWyss earned 1000 total points
ID: 12303745
What you are looking for is string.LastIndexOf() - it's a .NET framework thing, not a C# specific thing.
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LVL 14

Expert Comment

by:AvonWyss
ID: 12303755
(But for your task, I'd use a regular expression anyways.)
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