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(a.)..(..) zzzabcdefzzz y basic match
(a.)..(..) zzzabcdefzzz <mob: abcdef @ 3> basic $0
(a.)..(..) zzzabcdefzzz <mob[0]: ab @ 3> basic $1
(a.)..(..) zzzabcdefzzz <mob[1]: ef @ 7> basic $2
d()ef zzzabcdefzzz y empty capture
()ef zzzabcdefzzz y empty capture at start
(a(b(c))(d)) abcd y nested match
(a(b(c))(d)) abcd <mob: abcd @ 0> nested match
(a(b(c))(d)) abcd <mob[0]: abcd @ 0> nested match
(a(b(c))(d)) abcd <mob[1]: bc @ 1> nested match
(a(b(c))(d)) abcd <mob[2]: c @ 2> nested match
(a(b(c))(d)) abcd <mob[3]: d @ 3> nested match
(a)b(c) abc y multiple matches
(a)b(c) abc <mob[0]: a @ 0> basic $0
(a)b(c) abc <mob[1]: c @ 2> basic $1
b(.)\1 bookkeeper y backreference
b(.)\1(.)\2 bookkeeper y backreference
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