RegularExpressionValidator asp.net

Question

I am trying to make sure that user only can input a-z and 0-9 characters. To do this I have used the RegularExpressionValidator class:

<asp:TextBox ID="input" Text="search" runat="server" OnTextChanged="searchFunc"></asp:TextBox>
<asp:RegularExpressionValidator ID="regExp" runat="server"      
                                    ErrorMessage="only a-z or 0-9 allowed" 
                                    ControlToValidate="input"         
                                    ValidationExpression="^[a-z0-9]+$" />

Though in the code behind I am trying to check if the user entered valid input by using

regExp.IsValid

But this method returns True even if user inputs !&%() I can't understand what I've done wrong. Is it my regular expression that is wrong?

Looks fine to me: http://regex101.com/r/jO7nQ5 – sshashank124 Apr 14 '14 at 14:10 — sshashank124, Apr 14 '14 at 14:10

score 1 · Accepted Answer · answered Apr 14 '14 at 15:39

1

Call regExp.IsValid only after the validation has been performed otherwise the default value is set to true.

Try calling regExp.Validate() before checking the IsValid property.

answered Apr 14 '14 at 15:39

Vahi

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RegularExpressionValidator asp.net

1 Answers1