CODEWITHSUNDEEP
c#regexfluentvalidation
roadsunknown
roadsunknown

Reputation: 3210

Checking for Whitespace in FluentValidation

I'm using FluentValidation and trying to create a rule that throws error if there is any whitespace in the string, i.e. for a username.

I've reviewed these SOs, but doesn't seem to work, I'm sure my syntax is off just a little?

What is the Regular Expression For "Not Whitespace and Not a hyphen" and What is the Regular Expression For "Not Whitespace and Not a hyphen"

RuleFor(m => m.UserName).NotEmpty().Length(3, 15).Matches(@"/^\S\z/");

or

RuleFor(m => m.UserName).NotEmpty().Length(3, 15).Matches(@"[^\s]");

Neither of these seem to work. Other rules are not empty and between 3 and 15 characters.

Upvotes: 9

Views: 11265

Answers (5)

andrew pate
andrew pate

Reputation: 4299

 public static string RemoveWhitespace(this string input)
 {
    return new string(input.ToCharArray()
        .Where(c => !Char.IsWhiteSpace(c))
        .ToArray());
 }

RuleFor(x => x.Username).Must(s => s.Length == s.RemoveWhitespace().Length);

Upvotes: 0

Artur Kedzior
Artur Kedzior

Reputation: 4263

This worked for me with FluentValidation.MVC5 6.4.0

RuleFor(x => x.username).Must(u => !u.Any(x => Char.IsWhiteSpace(x)));

Upvotes: 3

user557597
user557597

Reputation:

Just modifying your original rule a bit
edit Ok, removing delimiters as suggested. 

RuleFor(m => m.UserName).NotEmpty().Length(3, 15).Matches(@"\A\S+\z");

All it does is force there to be non-whitespace in the whole string from start to finish.

Alternatively, I guess you could combine them into 1 match as in 

RuleFor(m => m.UserName).Matches(@"\A\S{3,15}\z");

Upvotes: 3

user342552
user342552

Reputation:

Try this:

RuleFor(m => m.UserName).NotEmpty().Length(3, 15).Must (u => !string.IsNullOrWhiteSpace(u));

Upvotes: 2

Blast_dan
Blast_dan

Reputation: 1125

Try the char.IsWhiteSpace

RuleFor(m => m.UserName).NotEmpty().Length(3, 15).Must(userName => !userName.All(c => char.IsWhiteSpace(c)))

Upvotes: 3

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