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Editorial Team
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Asked: 2026-05-13T14:59:06+00:00

How do I do this? I’ve seen a solution not using a single regex

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How do I do this? I’ve seen a solution not using a single regex for ruby becauase ruby doesn’t support loookaround assertions. But is it possible in c#?

[Test]
public void RarArchiveFirstFileNameShouldMatch() {
    var regex = new Regex(@"\.(rar|001)$", RegexOptions.IgnoreCase | RegexOptions.Singleline);
    Assert.That(regex.IsMatch("filename.001"));
    Assert.That(regex.IsMatch("filename.rar"));
    Assert.That(regex.IsMatch("filename.part1.rar"));
    Assert.That(regex.IsMatch("filename.part01.rar"));
    Assert.That(regex.IsMatch("filenamepart44.rar"));
    Assert.That(regex.IsMatch("filename.004"), Is.False);
    Assert.That(regex.IsMatch("filename.057"), Is.False);
    Assert.That(regex.IsMatch("filename.r67"), Is.False);
    Assert.That(regex.IsMatch("filename.s89"), Is.False);
    Assert.That(regex.IsMatch("filename.part2.rar"), Is.False);
    Assert.That(regex.IsMatch("filename.part04.rar"), Is.False);
    Assert.That(regex.IsMatch("filename.part11.rar"), Is.False);
}
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1 Answer

  1. Editorial Team

    This should pass your tests:

        var regex = new Regex(@"(\.001|\.part0*1\.rar|^((?!part\d*\.rar$).)*\.rar)$", RegexOptions.IgnoreCase | RegexOptions.Singleline);
    Assert.That(regex.IsMatch("filename.001"));
    Assert.That(regex.IsMatch("filename.rar"));
    Assert.That(regex.IsMatch("filename.part1.rar"));
    Assert.That(regex.IsMatch("filename.part01.rar"));
    Assert.That(regex.IsMatch("filename.004"), Is.False);
    Assert.That(regex.IsMatch("filename.057"), Is.False);
    Assert.That(regex.IsMatch("filename.r67"), Is.False);
    Assert.That(regex.IsMatch("filename.s89"), Is.False);
    Assert.That(regex.IsMatch("filename.part2.rar"), Is.False);
    Assert.That(regex.IsMatch("filename.part04.rar"), Is.False);
    Assert.That(regex.IsMatch("filename.part11.rar"), Is.False);
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