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my $re = qr/beer=(\d{2})(.*)(?:vodka=(\d{2}))?(.*)chips=(\d{3})/;
my $str1 = "beer=10&otherstuff&vodka=20&otherstuff&chips=100";
...
say for $str1 =~ /$re/g;
say "==";
say for $str2 =~ /$re/g;