my $pchr = "KQRBNP";
my $w1 = "QRKPNBNBQRK";
my $ascii = join '', map chr $_, 0..length($pchr);
my $w2 = join '', sort split //, eval "\$w1 =~ y/\Q$pchr\E/\Q$ascii\E/
+r";
eval "\$w2 =~ y/\Q$ascii\E/\Q$pchr\E/";
print "$w1 --[$pchr]--> $w2\n"
Or...
sub mk_sort {
my $pchr = shift;
my $a = join '', map chr, 0..length(\$pchr);
eval qq{sub { (join '', sort split //, (shift =~ y/\Q$pchr\E/\Q$a\
+E/r)) =~ y/\Q$a\E/\Q$pchr\E/r }};
}
my $sort = mk_sort "KQRBNP";
my $w1 = "QRKPNBNBQRK";
my $w2 = $sort->($w1);
print "$w1 --> $w2\n"
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