MVC5 Need Attribute to print error message, but allow blank

Hello
doing asp.net MVC 5 c#

I have a attribute in a MetadataType  the column is Money (decimal)  It okay to be null (blank) if not it must be a number

        [Required(ErrorMessage = "Enter costs in dollars with the the ($) dollar sign")]        
        [Display(Name = "Cost Amount To Date")]
        public Nullable<decimal> CostToDate { get; set; }

This forces required,   but blank should be acceptable, but if entry is made it must be number.  


Any help is appreciated
Charles BaldoSoftware DeveloperAsked:
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käµfm³d 👽Commented:
Please forgive me for being Captain Obvious, but if you accept blank, then it's not a required field.

Because you are requiring the user to enter the $ symbol--which BTW, doesn't seem like good UX--I think you'll probably want to use the RegularExpression attribute with a pattern of:

(?:\$\d+(?:\.\d{2})?)?

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If you choose to use this, then you'll need to remove the Required attribute.

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Charles BaldoSoftware DeveloperAuthor Commented:
Thanks Forgiven Captain :)

I realized that after and did go with a regex.  I also error on my message about $, I do not want them to enter $.  


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