Solution to task 2

1 files changed, 98 insertions, 0 deletions

diff --git a/challenge-347/jo-37/perl/ch-2.pl b/challenge-347/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..22d93a1db8
--- /dev/null
+++ b/challenge-347/jo-37/perl/ch-2.pl
@@ -0,0 +1,98 @@
+#!/usr/bin/perl
+
+use v5.26;
+use Test2::V0 -no_srand;
+use Test2::Tools::Subtest 'subtest_streamed';
+use Getopt::Long;
+use warnings FATAL => 'all';
+use Data::Dump qw(dd pp);
+use experimental 'signatures';
+
+use List::Gather;
+
+### Options and Arguments
+
+my ($tests, $examples, $verbose);
+GetOptions(
+    'examples!' => \$examples,
+    'tests!'    => \$tests,
+    'verbose!'  => \$verbose,
+) or usage();
+
+run_tests($examples, $tests);	# tests do not return
+
+usage() unless @ARGV;
+
+sub usage {
+    die <<~EOS;
+    $0 - format phone number
+
+    usage: $0 [-examples] [-tests] [PHONE]
+
+    -examples
+        run the examples from the challenge
+     
+    -tests
+        run some tests
+
+    PHONE
+        a string containing a single phone number
+
+    EOS
+}
+
+
+### Input and Output
+
+say format_phone_number("@ARGV");
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2025/11/14/ch-347.html#task-2
+
+sub format_phone_number {
+    join '-', gather {
+        shift =~ tr/0-9//cdr =~
+            /(?:(...)(?!.$)(?{take $+}))*(?:(..)(?{take $+}))*/;
+    }
+}
+
+
+### Examples and Tests
+
+sub run_tests ($examples, $tests) {
+    return unless $examples || $tests;
+
+    state sub run_example ($args, $expected, $name, $reason=undef) {
+        my $todo = $reason ? todo $reason : undef;
+        my $result = format_phone_number(@$args);
+        is $result, $expected,
+            "$name: (@$args) -> $expected";
+    }
+
+    plan 2;
+
+    $examples ? subtest_streamed(examples => sub {
+        my @examples = (
+            [["1-23-45-6"], "123-456", 'example 1'],
+            [["1234"], "12-34", 'example 2'],
+            [["12 345-6789"], "123-456-789", 'example 3'],
+            [["123 4567"], "123-45-67", 'example 4'],
+            [["123 456-78"], "123-456-78", 'example 5'],
+        );
+        plan scalar @examples;
+        run_example @$_ for @examples;
+    }) : pass 'skip examples';
+
+    $tests ? subtest_streamed(tests => sub {
+        my @tests = (
+            [["1234567890"], "123-456-78-90", 'multiple matches'],
+        );
+        plan scalar @tests;
+        run_example @$_ for @tests;
+    }) : pass 'skip tests';
+
+    exit;
+}