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Mastering C# for .NET Developers

Solution: Strict Username Validator

Understand how to create a strict username validator in C# by applying regular expressions with anchors and negated character classes. Learn to evaluate entire strings for forbidden characters and test multiple inputs to verify validation logic.

We'll cover the following...
C# 14.0
var validator = new UsernameValidator();
Console.WriteLine($"'Gamer123': {validator.IsValid("Gamer123")}");
Console.WriteLine($"'Pro Gamer': {validator.IsValid("Pro Gamer")}");
Console.WriteLine($"'user@name': {validator.IsValid("user@name")}");
Console.WriteLine($"'#champion': {validator.IsValid("#champion")}");
Console.WriteLine($"'': {validator.IsValid("")}");
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