C# Regular Expression to validate a date?

Question

I am trying to validate a date entered into a text box. There is an input mask on the textbox which forces input of xx/xx/xxxx. I am trying to use a regular expression valid

Answer 1

We can use a CustomValidator and use the override the ServerValidate method to check the TryParse!

Answer 2

This would be correct regular expression to use for date format dd/mm/yyyy

^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$

Answer 3

Kettenbach had a problem. His co-worker suggested using regexs. Kettenbach then had two problems.

As others have said, use DateTime.TryParse or DateTime.TryParseExact on a custom validator and save yourself the nightmare that is regex :)

Answer 4

This isn't really an answer, but couldn't you use DateTime.Parse or DateTime.TryParse to check that the date is correct?

Either that or use a DateTime control to make sure it's impossible to enter data that isn't a DateTime. There's lots of JavaScript out there on this subject.