MVC, RegularExpressionAttribute problem.

I am inheriting the RegularExpressionAttribute to create my own DataAnnotation for validating user input. It is not working for me.
I wish to only allow hyphens, spaces and upper/lowercase letters.
Regardless of what I input into the form on the MVC Web App, it shows the error message each time.
What am I doing wrong?

The custom DataAnnotation from the class is [NameValidation]

Code:

---

    public class NameValidationAttribute : RegularExpressionAttribute
    {
        public NameValidationAttribute()
            : base(@"/^[a-zA-Z \-]+$/")
        {
            ErrorMessage = "{0} can only consist of letters and spaces. Please correct your input.";
        }
    }

---

I even went to www.regexr.com and I put in the following regex. Says it is valid because it highlighted the text in the form on that site. But, when using it in my code above, I still get the error message on the view. What am I missing?

Code:

---

/([A-Za-z\-])\w+/g

---

I do not believe this is the right expression. It does not validate a single character, it does validate underscores.

Code:

---

/([A-Za-z \-])\w+/g

---

This is the right expression, but the problem is how it is being assigned.

Code:

---

[a-zA-Z \-]+

---

This does not work

Code:

---

public NameValidationAttribute() : base(@"/^[a-zA-Z \-]+$/")

---

This does work, notice how the forward slashes are omitted before the ^ and after the $.

Code:

---

public NameValidationAttribute() : base(@"^[A-Za-z \-]+$")

---

Just as a side note, you could assign the regular expression when declaring the attribute as below

Code:

---

   
public NameValidationAttribute(string Pattern)
    : base(Pattern)
{
}

// Then specify the attribute on the property of the model 
[NameValidation(@"^[A-Za-z \-]+$",ErrorMessage ="Not Valid Name")]
public string Name { get; set; }

---

To be honest, after all this work you are still only implementing the standard RegularExpressionAttribute and gaining nothing apart changing the name of the attribute.