SEDOLs
sub sedol( Str $s ) {
die 'No vowels allowed' if $s ~~ /<[AEIOU]>/;
die 'Invalid format' if $s !~~ /^ <[0..9B..DF..HJ..NP..TV..Z]>**6 $ /;
my %base36 = (flat 0..9, 'A'..'Z') »=>« ^36;
my @weights = 1, 3, 1, 7, 3, 9;
my @vs = %base36{ $s.comb };
my $checksum = [+] @vs Z* @weights;
my $check_digit = (10 - $checksum % 10) % 10;
return $s ~ $check_digit;
}
say sedol($_) for <
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
>;
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