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#!/usr/bin/env perl
use strict;
use warnings;
use feature qw{ postderef say signatures state };
no warnings qw{ experimental };
use Getopt::Long;
my $file = 'phone_numbers.txt';
GetOptions( 'file=s' => \$file, );
if ( -f $file && open my $fh, '<', $file ) {
# remove newlines from the numbers
my @numbers = map { chomp $_; $_ } <$fh>;
close $fh;
say join "\n", ( grep { is_phone_number($_) } @numbers ), '';
}
sub is_phone_number( $string ) {
return 1 if $string =~ m{
^\ * # starts with maybe space
\d{4} # then has four digits
\ # then one space
\d{10} # then has ten digits
\s*$ # with maybe ending spaces
}mix;
return 1 if $string =~ m{
^\ * # starts with maybe space
\+\d{2} # then has a plus sign and two digits
\ + # then one or more space
\d{10} # then has ten digits
\s*$ # with maybe ending spaces
}mix;
return 1 if $string =~ m{
^\ * # starts with maybe space
\(\d{2}\) # then has two digits within parens
\ + # then one or more space
\d{10} # then has eight digits
\s*$ # with maybe ending spaces
}mix;
return 0;
}
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