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Regular expressions

Posted on 2004-09-27
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Last Modified: 2010-04-23
Is it possible in VB.Net to write  a regular expression that will replace any character that appears more than once consecutively with just one of that character?

For example 'sssdftrgggh' -> 'sdftrgh' or 11125644766 -> 1256476

Thanks,

Tommy
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Question by:TommyV10
6 Comments
 
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by:RonaldBiemans
ID: 12159707
I don't know about a regular expression but this should do the same

Public Function removedbl(ByVal s As String) As String
        Dim returnstring As String
        Dim x As String = ""
        For y As Integer = 0 To s.Length - 1
            If Not s.Substring(y, 1) = x Then
                returnstring += s.Substring(y, 1)
                x = s.Substring(y, 1)
            End If
        Next
        Return (returnstring)
    End Function
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Expert Comment

by:bradtm
ID: 12161996
Here is a resource of hundreds of already made regexpressions.

http://regexlib.com/DisplayPatterns.aspx
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Bob Learned earned 500 total points
ID: 12170693
([\w])\1

Bob
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by:TommyV10
ID: 12177176
Thanks Bob, that sort of works but it only seems to perfrom the replace if an odd number of characters are encountered.  It will replace 'a' or 'aaa' to 'a' but leaves out 'aa' or 'aaaa'
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by:Bob Learned
ID: 12178742
Yeah, I noticed that too.  You could try a While...End While loop, until their are no more matches.

Bob
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Expert Comment

by:Bob Learned
ID: 12183039
([\w])\1+

Bob
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