Create ch-2.pl

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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given a phone number as a string containing digits, space and dash only.
+
+Write a script to format the given phone number using the below rules:
+
+1. Removing all spaces and dashes
+2. Grouping digits into blocks of length 3 from left to right
+3. Handling the final digits (4 or fewer) specially:
+   - 2 digits: one block of length 2
+   - 3 digits: one block of length 3
+   - 4 digits: two blocks of length 2
+4. Joining all blocks with dashes
+
+
+Example 1
+
+Input: $phone = "1-23-45-6"
+Output: "123-456"
+
+
+Example 2
+
+Input: $phone = "1234"
+Output: "12-34"
+
+
+Example 3
+
+Input: $phone = "12 345-6789"
+Output: "123-456-789"
+
+
+Example 4
+
+Input: $phone = "123 4567"
+Output: "123-45-67"
+
+
+Example 5
+
+Input: $phone = "123 456-78"
+Output: "123-456-78"
+=cut
+
+
+use Test2::V0 -no_srand => 1;
+is(format_phone_number("1-23-45-6"), '123-456', 'Example 1');
+is(format_phone_number("1234"), '12-34', 'Example 2');
+is(format_phone_number("12 345-6789"), '123-456-789', 'Example 3');
+is(format_phone_number("123 4567"), '123-45-67', 'Example 4');
+is(format_phone_number("123 456-78"), '123-456-78', 'Example 5');
+done_testing();
+
+
+sub format_phone_number
+{
+     my $phone = $_[0];
+     $phone =~ tr/- //ds;
+
+     $phone =~ s/(\d{3})(?=\d{2,4})/$1-/g;
+     my @arr = split(/\-/, $phone);
+     my $tail = pop @arr;
+
+     $tail = length($tail) < 4 ? $tail : 
+          join('-', substr($tail, 0, 2), substr($tail, 2)); 
+     push @arr, $tail;
+     return join('-', @arr);
+}