asp.net正则表达式检查不正确

Question

I have a simple regularExpression which checks to see if the given information is only 4 digits long and only contains digits. I have something that works but it doesn't allow the user to start the first digit off as a 0, any ideas why? Here is my regularexpression

[RegularExpression("^[0-9]{4,4}$", ErrorMessage = "PIN did not follow the correct format of 4-digits")]

More information

[Required(ErrorMessage = "Please input your 4 digit pin.")] [RegularExpression("^[0-9]{4,4}$", ErrorMessage = "PIN did not follow the correct format of 4-digits")] [Display(Name = "PIN")] public long PIN { get; set; }

Answer 1

If you use regexpal the regular expression is fine with numbers starting with zero. It looks like the problem is related to another issue.

A long cannot start with zero - PIN should be of type string .