.NET Regular Expression in Code Behind
Most the time when we’re using regular expressions we’re doing it with in our aspx page checking against a text box or some other control.
example
'
<asp:RegularExpressionValidator ID="regfirstName"
runat="server" ErrorMessage="This expression does not validate."
ControlToValidate="txtFirstName"
ValidationExpression="^[a-zA-Z0-9'.s]{1,40}$" />
'
When working with Query Strings you’ll need to compare the QueryString against a regular expression in the code behine, this is done by using the regex class from the System.Text.RegularExpressions namespace.
example
'
If Regex.IsMatch(Request.QueryString("region"), "^[a-zA-Z0-9s-]+$") Then
Else
End If
'
btw great site to help and/or get commonly user regular expressions is regexlib.com
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