first commit

Nitrox.Launcher/Models/Validators/NitroxWorldSeedAttribute.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text.RegularExpressions;
+
+namespace Nitrox.Launcher.Models.Validators;
+
+public sealed partial class NitroxWorldSeedAttribute : TypedValidationAttribute<string>
+{
+    [GeneratedRegex(@"^[a-zA-Z]{10}$")]
+    private static partial Regex NitroxWorldSeedRegex { get; }
+
+    protected override ValidationResult IsValid(string value, ValidationContext context)
+    {
+        if (string.IsNullOrEmpty(value) || NitroxWorldSeedRegex.IsMatch(value))
+        {
+            return ValidationResult.Success;
+        }
+
+        return new ValidationResult($"The field {context.DisplayName} must contain 10 alphabetical characters.");
+    }
+}