(a.)..(..)		zzzabcdefzzz	ab\tef			basic match
(a(b(c))(d))		abcd		abcd\tbc\tc\td		nested match
((%w+))			abcd		abcd\tabcd		nested match
(a*(.)%w(%s*))		aa!b c		aa!b \t!\t 		nested match
(a?)..			abcd		a			opt
(A?)..			abcd		''			opt
()aa()			flaaap		3\t5			empty capture
(.)%1			bookkeeper	o			backreference
(%w+)%s+%1		hello hello	hello			backreference
(.*)x			123x		123			repeated dot capture
$(%w+)			$abc=		abc			not escaped

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