asp.net regularexpressionvalidator ValidationExpression

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I want to make a asp.net regularexpressionvalidator ValidationExpression that will prevent to give input ; and –- .

I can do for – and it is ValidationExpression="[^-]*"

ASP.NET

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
            ControlToValidate="TextBox1" Display="Dynamic" ErrorMessage="**" 
            ValidationExpression="[^-]*"  >

Above expression can prevent single – character. I will give permission for single – chareter. I will block for double – character (--).
I need to prevent ; and – at a time.

block: ;.......--
:;......-
allow:....-

Can anyone help me?

Posted 11-Oct-11 8:57am

Rasadul Alam Rashed

Updated 11-Oct-11 9:00am

Mehdi Gholam

v2

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ahmedfaruk88 · Accepted Answer · 2011-10-11T09:37:00

Solution 1

Try this out

C#

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
            ControlToValidate="TextBox1" Display="Dynamic" ErrorMessage="**" 
            ValidationExpression="^[--;-]$"  >

Posted 11-Oct-11 9:37am

ahmedfaruk88

Updated 11-Oct-11 10:18am

v2