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How to validate a comma delimited string with Regex

Posted on 2006-06-26
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Last Modified: 2008-03-06
How to use RegEx to validate a string in the format of

12C;325252C;99999C;378C;28C;3535345342C;1C;56896745C

The valid format would be any number of numerical value + "C;" as the delimiter except the last element ends with "C"

Thanks.
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Question by:cyn_jiang
3 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 16988412
1) That looks like semi-colon delimited text, and not comma-delimited

2) Try this:

Imports System.Text.RegularExpressions

    If ValidateInput("12C;325252C;99999C;378C;28C;3535345342C;1C;56896745C") Then
      MessageBox.Show("Valid")
    End If

  End Sub

  Private Function ValidateInput(ByVal input As String) As Boolean
    Dim pattern As String = "^\d*C$"

    Dim elements As String() = input.Split(";")

    For Each element As String In elements

      If Not Regex.IsMatch(element, pattern) Then
        MessageBox.Show("Element is invalid:  " & element)
        Return False
      End If

    Next element

    Return True

  End Function

Bob
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LVL 63

Accepted Solution

by:
Fernando Soto earned 250 total points
ID: 16988812
Hi cyn_jiang;

This sample code will do what you want.

Imports System.Text.RegularExpressions

        ' Sample Data
        Dim data As String = "12C;325252C;99999C;378C;28C;3535345342C;1C;56896745C"
        ' Regex pattern to validate data
        Dim pattern As String = "^(\d+C;|\d+C)+$"

        ' Check to see if data is valid
        If Regex.IsMatch(data, pattern) Then
            MessageBox.Show("The data is vaild")
        End If


Fernando
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Author Comment

by:cyn_jiang
ID: 16991933
Sorry, it is semi-colon delimited text, I would allow them to input space in between the elements.

So I modified Fernando's code a little bit.

Imports System.Text.RegularExpressions
 
Dim pattern as String = "^(\d+(C; *)|\d+C)+$"

      If Regex.IsMatch(data, pattern) Then
            MessageBox.Show("The data is vaild")
        End If

Thanks for your help.
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