public void Backreference_Number()
{
var regex = RegularExpression.Of(
CaptureGroup.Of(Quantifiers.OneOrMore(Literal.For("a"))),
Quantifiers.ZeroOrMore(Literal.For("b")),
Backreference.For(1)
).ToRegex();
Assert.AreEqual(@"(a+)b*\1", regex.ToString());
}
public void Alternation_ByCapture()
{
var regex = RegularExpression.Of(
CaptureGroup.Of(new CaptureGroupOptions()
{
Name = "A"
}, Quantifiers.OneOrMore(Literal.For("A"))),
ConditionalAlternation.For(Literal.For("A"), Literal.For("Abc"), Literal.For("Xyz"))
).ToRegex();
Assert.AreEqual("(?<A>A+)(?(A)Abc|Xyz)", regex.ToString());
}
public void Backreference_Name_WithQuotes()
{
var regex = RegularExpression.Of(
CaptureGroup.Of(new CaptureGroupOptions()
{
Name = "a", UseQuotes = true
}, Quantifiers.OneOrMore(Literal.For("a"))),
Quantifiers.ZeroOrMore(Literal.For("b")),
Backreference.For("a", true)
).ToRegex();
Assert.AreEqual(@"(?'a'a+)b*\k'a'", regex.ToString());
}
public void Backreference_Name()
{
var regex = RegularExpression.Of(
CaptureGroup.Of(new CaptureGroupOptions()
{
Name = "a"
}, Quantifiers.OneOrMore(Literal.For("a"))),
Quantifiers.ZeroOrMore(Literal.For("b")),
Backreference.For("a")
).ToRegex();
Assert.AreEqual(@"(?<a>a+)b*\k<a>", regex.ToString());
}
public void UrlScheme()
{
var expression = RegularExpression.Of(
Anchors.Carot,
// scheme - (?:([A-Za-z]+):)?
Quantifiers.ZeroOrOne(
NonCaptureGroup.Of(
CaptureGroup.Of(
Quantifiers.OneOrMore(
CharacterGroup.Of(
Range.For(Literal.For('A'), Literal.For('Z')),
Range.For(Literal.For('a'), Literal.For('z'))
)
)
),
Literal.For(":")
)
),
// slash - (/{0,3})
CaptureGroup.Of(
Quantifiers.Between(Literal.For("/"), 0, 3)
),
// host - ([0-9.\-A-Za-z]+)
CaptureGroup.Of(
Quantifiers.OneOrMore(
CharacterGroup.Of(
Range.For(Literal.For('0'), Literal.For('9')),
Literal.For("."),
Literal.For("-"),
Range.For(Literal.For('A'), Literal.For('Z')),
Range.For(Literal.For('a'), Literal.For('z'))
)
)
),
// port - (?::(\d+))?
Quantifiers.ZeroOrOne(
NonCaptureGroup.Of(
Literal.For(":"),
CaptureGroup.Of(
Quantifiers.OneOrMore(CharacterClasses.Digit)
)
)
),
// path - (/[^?#]*)?
Quantifiers.ZeroOrOne(
CaptureGroup.Of(
Literal.For("/"),
Quantifiers.ZeroOrMore(
CharacterGroup.Of(
new CharacterGroupOptions()
{
IsNegated = true
},
Literal.For("?"),
Literal.For("#")
)
)
)
),
// query - (?:\?([^#]*))?
Quantifiers.ZeroOrOne(
NonCaptureGroup.Of(
Literal.For("?"),
CaptureGroup.Of(
Quantifiers.ZeroOrMore(
CharacterGroup.Of(new CharacterGroupOptions()
{
IsNegated = true
}, Literal.For("#"))
)
)
)
),
// hash - (?:#(.*))?
Quantifiers.ZeroOrOne(
NonCaptureGroup.Of(
Literal.For("#"),
CaptureGroup.Of(
Quantifiers.ZeroOrMore(CharacterClasses.Wildcard)
)
)
),
Anchors.Dollar
);
var regex = expression.ToRegex();
var source = regex.ToString();
const string urlRegex = @"^(?:([A-Za-z]+):)?(/{0,3})([0-9.\-A-Za-z]+)(?::(\d+))?(/[^?#]*)?(?:\?([^#]*))?(?:\#(.*))?$";
Assert.AreEqual(urlRegex, source);
}