Sanitized File Name C#

SanitizedFileName.cs

using System.IO;
using System.Text.RegularExpressions;

namespace Mojito.Core
{
    public class SanitizedFileName
    {
        // https://msdn.microsoft.com/en-us/library/aa365247.aspx#naming_conventions
        // http://stackoverflow.com/questions/146134/how-to-remove-illegal-characters-from-path-and-filenames
        private static readonly Regex removeInvalidChars = new Regex($"[{Regex.Escape(new string(Path.GetInvalidFileNameChars()))}]",
            RegexOptions.Singleline | RegexOptions.Compiled | RegexOptions.CultureInvariant);

        public SanitizedFileName(string fileName, string replacement = "_")
        {
            Check.NotNull(fileName, nameof(fileName));
            Value = removeInvalidChars.Replace(fileName, replacement);
        }

        public string Value { get; }
    }
}

SanitizedFileNameTests.cs

using Shouldly;
using Mojito.Core;
using Xunit;

namespace UnitTests.Core
{
    public class SanitizedFileNameTests
    {
        [Theory]
        [InlineData("asdf.txt", "asdf.txt")]
        [InlineData("\"<>|:*?\\/.txt", "_________.txt")]
        [InlineData("yes_its_valid_~!@#$%^&()_+.txt", "yes_its_valid_~!@#$%^&()_+.txt")]
        public void Sanitize_SpecifiedFileName_ValueAsExpected(string fileName, string expectedSanitized)
        {
            // https://msdn.microsoft.com/en-us/library/aa365247.aspx#naming_conventions
            var sanitized = new SanitizedFileName(fileName);
            sanitized.Value.ShouldBe(expectedSanitized);
        }

        [Fact]
        public void Sanitize_WithCustomReplacement_ReplacedAsExpected()
        {
            var sanitized = new SanitizedFileName("*_*.txt", "Yo");
            sanitized.Value.ShouldBe("Yo_Yo.txt");
        }
    }
}