Regular expression to validate valid time

Question

Can someone help me build a regular expression to validate time?

Valid values would be from 0:00 to 23:59.

When the time is less than 10:00 it should also su

Answer 1

[RegularExpression(@"^(0[1-9]|1[0-2]):[0-5][0-9]:[0-5][0-9] (am|pm|AM|PM)$", 
                   ErrorMessage = "Invalid Time.")]

Try this