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"aaaa" =~ /a*a*b/
"aaaa" =~ m/ (a*) (a*) (?{ print "Tried $`($1)($2)\n"; }) (?!) /x;
Tried (aaaa)() Tried (aaa)(a) ... Tried aaa()(a) Tried aaa()() Tried aaaa()()
24670925422945900903156716 (= 2e25)
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