CODEWITHSUNDEEP
c#regex
pete
pete

Reputation: 154

Regex matching whitespaces in C#

I have a regular expresion to validate paths of type Number/string/string that looks so: ^[0-9]{1,}(/[0-9a-zA-Z_-]+)*$

If I'm right it should not allow whitespaces, this should be invalid:

2/Pathtest/thirdlevel/bla bla

In online testers like Myregextester it works as expected, but in my c# code it returns true with whitespaces... what am I doing wrong?

if (!Regex.IsMatch(Path.GetDirectoryName(folder.Path).Replace("\\", "/"), @"^[0-9]{1,}(/[0-9a-zA-Z_-]+)*$"))
{
    throw new ArgumentException(Resources.Strings.FileNameNotAzureCompatible);
}

Upvotes: 0

Views: 92

Answers (2)

johannes.colmsee
johannes.colmsee

Reputation: 175

    static void Main(string[] args)
    {
        var pattern = @"^[0-9]{1,}(/[0-9a-zA-Z_-]+)*$";
        string shouldNotMatchString = @"2/Pathtest/thirdlevel/bla bla";
        bool shouldBeFalse = Regex.IsMatch(shouldNotMatchString, pattern);

        string shouldMatchString = @"2/Pathtest/thirdlevel/blabla";
        bool shouldBeTrue = Regex.IsMatch(shouldMatchString, pattern);
    }

guess what....shouldBeFale is false, shouldBeTrue is true. your regex seems to be fine.

Upvotes: 1

Orace
Orace

Reputation: 8359

Your regex seems wrong.
You should escape the /: 

^[0-9]{1,}(\/[0-9a-zA-Z_-]+)*$

Upvotes: 0

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