How to add ASCII only data annotation

Question

I am using data annotations for validation and I want to use a RegularExpression Data annotation to check the string has only ASCII characters.

      public class SomeObject
{
    [Required]
    public int Id { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    [MaxLength(4000)]       
    [RegularExpression(@"[^\u0000-\u007F]+")]
    public string Text { get; set; }
}

Can you help me fix the regular expression to allow only ASCII characters

im sure that is nothing like how you can do it. ASCII characters would basically be every key on your keyboard plus more.. so i would image this looks to simple to be valid. Im going to follow this, ps what did google say. — Seabizkit, Mar 21 '17 at 18:22

bl4y. · Answer 1 · 2017-03-21T18:28:57.130

2

If you want to test for the full ASCII set:

[RegularExpression(@"^[\x00-\x7F]+$")]
public string Text { get; set; }

And if not for the full ASCII set (this won't pass for characters other than a-z (uppercase too) and 0-9):

[RegularExpression(@"^\w+$")]
public string Text { get; set; }

edited Mar 21 '17 at 18:28

answered Mar 21 '17 at 18:26

bl4y.

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Yea, you're right. Since both upper and lowercase should pass the test, **\w** seems a better choice. – bl4y. Mar 21 '17 at 18:28

How to add ASCII only data annotation

1 Answers1