Another way to do it: 

my %order;
/(?=.*(a))(?=.*(b))(?=.*(c))/ and @order{ qw/a b c/ } = @-[ 1 .. $#- ]
+;

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

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