That's actually a really nice way to use a hash to look through a string and replace keys with values.

You could even generalize it to multi-character keys: 

my %value_lkup = (
    A => '1000',
    B => '2000',
  CDE => '3000',
);

my $pat = '(?:' . join('|', keys %value_lkup) . ')';
s/($pat)/$value_lkup{$1}/g;

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In reply to Re^2: regex question by markkawika
in thread regex question by nate_

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