Groups

Function	RegExp equivalent	Explanation
capture`foo` capture.exactly`foo` capture('foo')	(foo)	Wrap the given token in a capture group
captureAs`name` `foo` captureAs`name`.exactly`foo` captureAs('name')('foo')	(?<name>foo)	Wrap the given token in a named capture group
captureAs`name` `foo`.ref`name` capture`foo`.ref(1)	(?<name>foo)\k<name> (foo)\1	Supply a number to reference the capture group with that index. Supply a string to reference a named capture group.
group`foo` group.exactly`foo` group('foo')	(?:foo)	Wrap the given token in a non-capture group
ahead`foo` ahead.exactly`foo` ahead('foo')	(?=foo)	Wrap the given token in a positive lookahead
behind`foo` behind.exactly`foo` behind('foo')	(?<=foo)	Wrap the given token in a positive lookbehind
notAhead`foo` not.ahead`foo` notAhead.exactly`foo` notAhead('foo')	(?!foo)	Wrap the given token in a negative lookahead
notBehind`foo` not.behind`foo` notBehind.exactly`foo` notBehind('foo')	(?<!foo)	Wrap the given token in a negative lookbehind
oneOf`foo` `bar` oneOf(exactly`foo`, exactly`bar`) oneOf('foo', 'bar')	(?:foo|bar)	Match one in the provided list of options