OP submatches [('a', 'a', '', ''), ('6', '6', '6', ''), ('o', 'o', '', ''), ('r', 'r', '', ''), ('6.4', '6.4', '6.4', '.4'), ('b', 'b', '', ''), ('a', 'a', '', ''), ('b', 'b', '', ''), ('7', '7', '7', ''), ('o', 'o', '', ''), ('r', 'r', '', ''), ('7', '7', '7', ''), ('r', 'r', '', ''), ('t', 't', '', ''), ('R', 'R', '', ''), ('7.55', '7.55', '7.55', '.55'), ('t', 't', '', ''), ('a', 'a', '', ''), ('r', 'r', '', ''), ('o', 'o', '', ''), ('r', 'r', '', ''), ('5 6', '5 6', '5 6', ' 6')]
Comment matches [('', '', 'a', '6'), ('', '', 'r', '6.4'), ('', '', 'b', '7'), ('', '', 'r', '7'), ('', '', 'R', '7.55'), ('', '', 'r', '5')]
Answer matches [('a 6', '', ''), ('r 6.4', '.4', ''), ('b 7', '', ''), ('r 7', '', ''), ('R 7.55', '.55', ''), ('r 5 6', ' 6', '')]
Updated answer [('a 6', '', ''), ('6.4 b', '', '.4')]