Question

I mean like this

" T" It’s no 3 Character
"T T" It’s no 3 Character
" T " It isn.
"TTT" It’s true
" TTT" is true
" TT T" is true

how to check that with regex

i’m trying "^[\s]{3,100}$" but it does’nt work

Thanks.

Answer 1

I’m assuming you want to test for at least three non-whitespace characters. In which case this pattern should work.
^\s*(\S\s*){3,100}$

    [Test]
    public void Test()
    {
        Regex pattern = new Regex(@"^\s*(\S\s*){3,100}$");

        Assert.IsFalse(pattern.IsMatch(" T"));
        Assert.IsFalse(pattern.IsMatch("T T"));
        Assert.IsFalse(pattern.IsMatch(" TT"));
        Assert.IsTrue(pattern.IsMatch("TTT"));
        Assert.IsTrue(pattern.IsMatch(" TTT"));
    }

What isn’t clear from your question is if white space is allowed or if the match should fail if any white space is present.