Need help with validation annotation in ASP.Net core MVC. When I test out the fields, it gives errors stating the fields do not match the given regex.

Question 1: The pizza name field is required, and only consists of English letters, digits, spaces and underscore, and has a length between 3 characters and 20 characters inclusive.

Question 2: The pizza price should be in the range from $5.00 to $20.00 inclusive.

Answer to question 1: [RegularExpression(@"[A-Z][a-z_ ][0-9]{3,20}")]

Answer to question 2: [RegularExpression(@"${5.00,20.00}")]