Regular Expression for (dd-mm-yyyy) not working properly

Question

I have a RegularExpressionValidator in my ASP.Net page

I am using it for checking the valid date including leap year against the TextBox Control.

The code is:

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"   
ErrorMessage="Enter Valid Date" Display="Dynamic" Font-Bold="true" ForeColor="Red" 
ValidationExpression=
"^(((0[1-9]|[12]\d|3[01])(-|\/)(0[13578]|1[02])(-|\/)((19|[2-9]\d)\d{2}))|((0

[1-9]|[12]\d|30)(-|\/)(0[13456789]|1[012])(-|\/)((19|[2-9]\d)\d{2}))|((0[1-9]|1      
\d|2[0-8])(-|\/)02(-|\/)

((19|[2-9]\d)\d{2}))|(29(-|\/)02(-|\/)((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579]
[26])|   ((16|[2468]

[048]|[3579][26])00))))$" ControlToValidate="txtbdate">  
</asp:RegularExpressionValidator>

All dates are checked fine but the date : 09-09-2000 cannot be checked..

Please help..

Thanks in advance.

why not cast it to datetime using `Tryparse` which returns boolean. It will return false if you have invalid date. — John Woo, Feb 04 '13 at 09:45
On top of which there is even a datetime function, IsLeapYear if the above suggestion passes and you want to know — , Feb 04 '13 at 09:55
Check out [this answer](http://stackoverflow.com/a/939852/453314) for a more readable solution. — Westy92, Dec 31 '13 at 06:33

score 0 · Answer 1 · answered Feb 04 '13 at 09:55

0

The second 'line' will match that.

I suspect it is all those newlines in the regex causing the issue.

((0[1-9]|[12]\d|30)(-|\/)(0[13456789]|1[012])(-|\/)((19|[2-9]\d)\d{2}))

You can test it here: http://regexpal.com/

Works fine for me.

answered Feb 04 '13 at 09:55

leppie

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Regular Expression for (dd-mm-yyyy) not working properly

1 Answers1