How to give validation for accountno and BSB no in MVC

Account No* – Minimum and maximum of 8 numbers only.  
It should accept the first number is a "0" only
 
BSB* – Minimum and maximum of 6 numbers only. 
 ACCEPTABLE FORMAT IS :  000-000 (this is example only.  
Length:  must be 6 numbers only. 

I have tried this :-

[Required(ErrorMessage = "Please enter the BSB")]
        [Display(Name = "BSB")]
        [RegularExpression("^[0-9]*$", ErrorMessage = "Please Enter only Numbers")]
        [StringLength(6, ErrorMessage = "The BSB must be 6 numbers only.", MinimumLength = 6)]
        public string BSB { get; set; }
 
        [Required(ErrorMessage = "Please enter the AccountNo")]
        [RegularExpression("^[0-9]*$", ErrorMessage = "Please Enter only Numbers")]
        [StringLength(8, ErrorMessage = "The BankAccountNo must be 8 numbers only.", MinimumLength = 8)]
        public string BankAccountNo { get; set; }