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Need Regular Expression that allows letters, numbers, and standard puctuation

Posted on 2008-10-19
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Last Modified: 2009-07-29
I am developing a web site in ASP.NET with VB.NET on MS Visual Web Developer.  I have a number of form fields requiring validation.  I have regualr expression, "^[a-zA-Z0-9]+(([\'\,\.\!\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$", but I need one that allows numbers, letters, dash and standard punctuation (- . , ! ).  Can someone please help me with this?
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Question by:OVC-it-guy
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Expert Comment

by:Muhammad Kashif
Comment Utility
What I understood that you want that your textbox should allow numbers, letters, dash and ... Not the regular expression with specific format.

Then you should use KeyDown and KeyPress event.

So use in following way It will allow only Numbers to be entered in TextBox1

In the same way you can add more checks.
e.g. for letters add check in KeyDown Event.

If e.KeyCode < Keys.A OrElse e.KeyCode > Keys.Z Then

Public EnteredText As Boolean
 

Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown

    EnteredText = False

    If e.KeyCode < Keys.D0 OrElse e.KeyCode > Keys.D9 Then

        If e.KeyCode < Keys.NumPad0 OrElse e.KeyCode > Keys.NumPad9 Then

            If e.KeyCode <> Keys.Back And e.KeyCode <> Keys.Subtract Then

                EnteredText = True

            End If

        End If

    End If

End Sub
 
 

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress

    If EnteredText = True Then

        e.Handled = True

        EnteredText = False

    End If

End Sub

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by:Muhammad Kashif
Comment Utility
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by:OVC-it-guy
Comment Utility
That's a lot more code than what I'm looking for.  I just need the validationExpression similar to something like ^[-a-zA-Z0-9.,! ]$ might do it.  I was looking for some with more experince on this type of expression.
<asp:RegularExpressionValidator ID="CommentsRegex" runat="server" ControlToValidate="txtComments" ValidationExpression="^[a-zA-Z0-9]+(([\'\,\.\!\- ][a-zA-Z0-9 ])?[a-zA-Z0-9]*)*$" ErrorMessage="Please enter only letters, numbers and punctuation." />

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Accepted Solution

by:
petiex earned 500 total points
Comment Utility
^[a-zA-Z0-9\'\,\.\!\-\?]*$
Will match zero or more numbers, characters, and the following characters
' , . ! - ?

If you want it also to match space characters, put a space somewhere between the brackets:
^[a-zA-Z0-9\'\,\.\!\-\? ]*$

To match one or more characters, use + instead of *:
^[a-zA-Z0-9\'\,\.\!\-\? ]+$
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by:petiex
Comment Utility
To make sure you are matching what you want to match, there's a nice regex tester here that I like to use: http://www.regular-expressions.info/javascriptexample.html

That site also has everything you could possibly want to know about regular expressions if you click around.
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Author Comment

by:OVC-it-guy
Comment Utility
Thanks, petiex.
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