Help for this page
($nth_chunk) = $text =~ /(?:PREFACE(MATCH)POSTFIX){N}/;
my ($number13) = $text =~ /(?:<TD nowrap>(.*?)</TD>\n){13}/;
"abcdef" =~ /(.)/; # $1 is "a" "abcdef" =~ /(.)+/; # $1 is "f"