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my $datetime = '2009-09-22 20::45::30'; printf('%3$s/%2$s/%1$s[%4$s::%5$s::%6$s]'."\n", $datetime =~ /(\d+)/g );
my $datetime = '2009-09-22 20::45::30'; printf("%s/%s/%s[%s::%s::%s]\n", ( $datetime =~ /(\d+)/g )[2,1,0,3,4,5] );
my $datetime = '2009-09-22 20::45::30'; (my $print_date = $datetime) =~ s{(\d+)-(\d+)-(\d+) (.*)}{$3/$2/$1\[$4]}; print("$print_date\n");