i--flex-syntax		a
i			"a"
i			("a")
i--posix-captures	("a")
i			[a]
i			"a"?
i			"a"*
i			"a"+
i			"a"{1}
i			"a"{1,}
i			"a"{1,2}
i--tags			@x "a" @y
i--tags			#x "a" #y
