public void TestFlags()
{
var regexOptions = new RegexOptions();
Assert.IsFalse(regexOptions.HasFlag(RegexOptions.Singleline));
regexOptions = regexOptions.SetFlags(RegexOptions.Singleline, RegexOptions.ECMAScript);
Assert.IsTrue(regexOptions.HasFlag(RegexOptions.Singleline));
Assert.IsTrue(regexOptions.HasFlag(RegexOptions.ECMAScript));
Assert.IsTrue(regexOptions.HasFlags(RegexOptions.ECMAScript));
Assert.IsTrue(regexOptions.HasFlags(RegexOptions.Singleline, RegexOptions.ECMAScript));
Assert.IsFalse(regexOptions.HasFlags(RegexOptions.Singleline, RegexOptions.ExplicitCapture));
regexOptions = regexOptions.SetFlag(RegexOptions.ExplicitCapture);
regexOptions = regexOptions.ClearFlags(RegexOptions.Singleline, RegexOptions.IgnorePatternWhitespace);
Assert.IsFalse(regexOptions.HasFlag(RegexOptions.Singleline));
Assert.IsTrue(regexOptions.HasFlag(RegexOptions.ExplicitCapture));
regexOptions = regexOptions.ClearFlag(RegexOptions.ExplicitCapture);
Assert.IsFalse(regexOptions.HasFlag(RegexOptions.ExplicitCapture));
}
