c# - Regular Expression w is not working

Question

I am working an an asp.net core app.

I have validation in place..

I am trying to prohibit the user from entering only spaces. So I use this:

    [Display(Name = "Reason for Cancellation")]
    [Required]
    [RegularExpression(@"w", ErrorMessage = CancellationValidationErrorMessage)]
    [StringLength(245)] // 245 characters to allow for History Type prefix to be added
    public string CancelJustificationComments { get; set; }

And whilst the error pops up stating that i must supply an entry I also get the error on any other input as well.

What is wrong?

Answer 1

The regex validator requires that the whole text matches the regex. So this w only matches a single character entry.

Solution: add some wildcards around it: .*w.*