4 files changed, 77 insertions, 0 deletions
diff --git a/challenge-110/polettix/blog.txt b/challenge-110/polettix/blog.txt
new file mode 100644
index 0000000000..4af1620081
--- /dev/null
+++ b/challenge-110/polettix/blog.txt
@@ -0,0 +1 @@
+https://github.polettix.it/ETOOBUSY/2021/04/28/pwc110-valid-phone-numbers/
diff --git a/challenge-110/polettix/blog1.txt b/challenge-110/polettix/blog1.txt
new file mode 100644
index 0000000000..087d74fa0f
--- /dev/null
+++ b/challenge-110/polettix/blog1.txt
@@ -0,0 +1 @@
+https://github.polettix.it/ETOOBUSY/2021/04/29/pwc110-transpose-file/
diff --git a/challenge-110/polettix/perl/ch-1.pl b/challenge-110/polettix/perl/ch-1.pl
new file mode 100644
index 0000000000..56e9843c48
--- /dev/null
+++ b/challenge-110/polettix/perl/ch-1.pl
@@ -0,0 +1,42 @@
+#!/usr/bin/env perl
+use 5.024;
+use warnings;
+use experimental qw< postderef signatures >;
+no warnings qw< experimental::postderef experimental::signatures >;
+
+sub is_phone_number_acceptable ($n) {
+   scalar(
+      $n =~ m{
+         \A
+         (?:
+               \+\d\d     # +nn
+            |  \(\d\d\)   # (nn)
+            |  \d{4}      # nnnn
+         )
+         \s+
+         \d{10}           # nnnnnnnnnn
+         \z
+      }mxs
+   );
+}
+
+sub valid_phone_numbers ($f) {
+   $f = ref($f)     ? $f
+      : ($f eq '-') ? \*STDIN
+      :               do { open my $h, '<', $f or die "$!\n"; $h };
+   is_phone_number_acceptable(s{\A\s+|\s+\z}{}rgmxs) && print while <$f>;
+}
+
+my $f = shift // do {
+   my $input = <<'END';
+0044 1148820341
+ +44 1148820341
+  44-11-4882-0341
+(44) 1148820341
+  00 1148820341
+END
+   open my $fh, '<', \$input;
+   $fh;
+};
+
+valid_phone_numbers($f);
diff --git a/challenge-110/polettix/perl/ch-2.pl b/challenge-110/polettix/perl/ch-2.pl
new file mode 100644
index 0000000000..081dd7cada
--- /dev/null
+++ b/challenge-110/polettix/perl/ch-2.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+use 5.024;
+use warnings;
+use experimental qw< postderef signatures >;
+no warnings qw< experimental::postderef experimental::signatures >;
+
+sub transpose_file ($f) {
+   $f = ref($f)     ? $f
+      : ($f eq '-') ? \*STDIN
+      :               do { open my $h, '<', $f or die "$!\n"; $h };
+   my @lines = map { chomp; [ split m{,}mxs ] } <$f>;
+   while ('necessary') {
+      my $g = 0;
+      my @t = map { $g = 1 if $_->@*; shift($_->@*) || '' } @lines;
+      last unless $g;
+      say join ',', @t;
+   }
+   return;
+}
+
+my $f = shift // do {
+   my $input = <<'END';
+name,age,sex
+Mohammad,45,m
+Joe,20,m
+Julie,35,f
+Cristina,10,f
+END
+   open my $fh, '<', \$input;
+   $fh;
+};
+
+transpose_file($f);