2 files changed, 68 insertions, 0 deletions
diff --git a/challenge-135/james-smith/perl/ch-1.pl b/challenge-135/james-smith/perl/ch-1.pl
new file mode 100644
index 0000000000..a91fc49d88
--- /dev/null
+++ b/challenge-135/james-smith/perl/ch-1.pl
@@ -0,0 +1,31 @@
+#!/usr/local/bin/perl
+
+use strict;
+
+use warnings;
+use feature qw(say);
+use Test::More;
+use Benchmark qw(cmpthese timethis);
+use Data::Dumper qw(Dumper);
+
+my @TESTS = (
+  [ 1234567, 345 ],
+  [ -123,    123 ],
+  [ 1,       'Too short'    ],
+  [ 'dred',  'Not a number' ],
+  [ 1000,    'Even digits'  ],
+);
+
+is( middle3($_->[0]), $_->[1] ) foreach @TESTS;
+
+done_testing();
+
+sub middle3 {
+  my $n = shift;
+  return 'Not a number' unless $n =~ m{^-?\d+$};
+  return 'Too short'    unless $n =~ m{\d{3}};
+  return 'Even digits'  if $n =~ m{^-?(?:\d\d)+$};
+  $n =~ s{^-}{};
+  return substr $n, (-3 + length $n ) / 2, 3;
+}
+
diff --git a/challenge-135/james-smith/perl/ch-2.pl b/challenge-135/james-smith/perl/ch-2.pl
new file mode 100644
index 0000000000..2585b4f41d
--- /dev/null
+++ b/challenge-135/james-smith/perl/ch-2.pl
@@ -0,0 +1,37 @@
+#!/usr/local/bin/perl
+
+use strict;
+
+use warnings;
+use feature qw(say);
+use Test::More;
+use Benchmark qw(cmpthese timethis);
+use Data::Dumper qw(Dumper);
+
+my @TESTS = (
+  [ '2936921', 1 ],
+  [ '1234567', 0 ],
+  [ 'B0YBKL9', 1 ],
+  [ '0263494', 1 ],
+  [ '0540528', 1 ],
+  [ 'BG03Y86', 1 ],
+);
+
+is( is_sedol($_->[0]), $_->[1] ) foreach @TESTS;
+
+done_testing();
+
+sub is_sedol {
+## Check correct format...
+  return 0 unless $_[0] =~ m{^[0-9B-HJ-NP-TW-Z]{6}\d$};
+
+## Total and weights foreach digit
+  my( $t, @wts ) = qw(0 1 3 1 7 3 9 1);
+
+## Calculate SEDOL sum... note YODA sum -55 + ord $_ to avoid precedence issue
+  $t += shift @wts * ( $_ =~/[A-Z]/ ? -55 + ord $_ : $_ ) foreach split m//, $_[0];
+
+## Return true if total modulo 10 is 0
+  return $t % 10 ? 0 : 1;
+}
+