ASP.NET regular expression - validationExpression

Question

I have a text box. I added a regular expression to validate the text box that can contain one or 20 characters as below

<asp:RegularExpressionValidator ID="regex" runat="server" 
     ErrorMessage="This contain pipe or more than 20 characters"  
     ValidationExpression="^.{1,20}$"
     ControlToValidate="txtRegexTester" >
</asp:RegularExpressionValidator>

I want to make sure the text box does not contain the PIPE (|) symbol also. How do I achieve both in one ValidationExpression?

shA.t · Accepted Answer · 2015-05-19 04:44:16Z

2

Something like this maybe (everything but pipe, 1 or 20 times)

"^[^|]{1,20}$"

edited May 19, 2015 at 4:44

shA.t

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answered Jul 15, 2014 at 20:51

Raphaël Althaus

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1 Comment

dee-see Over a year ago

This probably has better performance than my answer! One note: you don't need to escape the | in a character class.

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