This code does not work: 
/^(?=.*a)(?=.*b)(?=.*c).*d/

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For example, when used in the code below nothing s returned. 
echo bacd| perl -ne '/^(?=.*a)(?=.*b)(?=.*c).*d/; print "$1 $2 $3\n";'

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In reply to Re^2: How to replace greedy alternation? by Anonymous Monk
in thread How to replace greedy alternation? by adamcrussell

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