Regex Validators in asp.net - validate all strings except those with a specific character

Question

I'd like to use a asp:RegularExpressionValidator where the ValidatorExpression is a regex that matches all strings that do not contain an ampersand. Google fu didn't yield much, but I'm sure it's probably not too complicated.

<asp:RegularExpressionValidator
   ID="StringValidator1"
   runat="server"
   ControlToValidate="textBox1"
   ValidationExpression="???"
   Display="Dynamic"
   ErrorMessage="String cannot contain ampersands"
   ValidationGroup="Group1"
/>

Thanks.

Tim Pietzcker · Accepted Answer · 2014-02-13 17:33:33Z

3

ValidationExpression = "^[^&]*$"

matches any string that doesn't contain an ampersand.

Explanation:

^      # Start of string
[^&]*  # Any number of characters that are not ampersands
$      # End of string

answered Feb 13, 2014 at 17:33

Tim Pietzcker

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Sabuj Hassan · Accepted Answer · 2014-02-13 17:33:33Z

1

Your regex will be

^[^&]+$

Means everything except &

answered Feb 13, 2014 at 17:33

Sabuj Hassan

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