Re: How do I break down a phone number and rebuild it?

[steveAZ98]

I take a slightly different approach because I have to deal with foreign phone numbers also. This sub seems to work pretty good for me. If it can't find a format it just splits it up into groups of threes and sends it back.
HTH

sub fphone {
    shift;
    s/[\s|\n|\r]//g;    # strip space and newlines
    s/[-|)|(|.]//g;     # strip seperating chars
    s/(x|ex|ext\.)(.*)$//;      # Extension
    my $ext = $2;       # save extension
    my $n = '';
    my $l = length($_);
    if (($l == 12)||($l == 13)) {
        m/(\+\d{2}|\d{3})(\d{3})(\d{3})(\d{3})/;
        $n .= "$1 $2 $3 $4";
    } elsif (length == 11) {                # us with leading 1
        s/[+]//g;
        m/(\D)?(\d{3})(\d{3})(\d{4})/;
        $n .= "$1 " if $1 =~ /\d/;
        $n .= "($2) $3-$4";
    } elsif ($l == 10) {                    # us regular
        s/[+]//g;
        m/(\d{3})(\d{3})(\d{4})/;
        $n .= "($1) $2-$3";
    } else {
        s/(\d\d\d)/$1 /g;
        $n .= $_;
    }
    $n .= " Ext. $ext" if $ext;
    return $n;
}

[Fastolfe]

I might have tried to generalize that even further, though you still have regional issues to worry about. I.e. this won't work for everyone:

@FORMAT_PHONE = (
   '%d%d%d',                              # 911 
   '%d-%d%d%d',                           # 1-411
   '%d-%d%d%d%d',                         # 5-1212 ?
   '%d%d-%d%d%d%d',                       # 55-1212 ?
   '%d%d%d-%d%d%d%d',                     # 555-1212
   '%d-%d%d%d-%d%d%d%d',                  # 1-222-2345
   '%d%d%d-%d%d%d-%d%d%d',                # 212-114-151 ?
   '(%d%d%d) %d%d%d-%d%d%d%d',            # [phone]
   '+%d (%d%d%d) %d%d%d-%d%d%d%d',        # [phone]
   '+%d%d (%d%d%d) %d%d%d-%d%d%d%d',      # +01 [phone]
   '+%d%d%d (%d%d%d) %d%d%d-%d%d%d%d',    # +011 [phone]
   '+%d%d%d %d (%d%d%d) %d%d%d-%d%d%d%d', # +011 1 [phone]
   '%d%d%d%d%d (%d%d%d) %d%d%d-%d%d%d%d', # 10321 [phone]
   '%d%d%d%d%d %d (%d%d%d) %d%d%d-%d%d%d%d',  # 10321 1 [phone]
   '%d%d%d%d-%d%d%d (%d%d%d) %d%d%d-%d%d%d%d', # 1010-220 (800) 555-12
+12
   '%d%d%d%d-%d%d%d %d (%d%d%d) %d%d%d-%d%d%d%d', # 1010-220 1 (800) 5
+55-1212
   # etc...
);

my %L2M;
@L2M{qw: Q Z   :} = 1;
@L2M{qw: A B C :} = 2;
@L2M{qw: D E F :} = 3;
@L2M{qw: G H I :} = 4;
@L2M{qw: J K L :} = 5;
@L2M{qw: M N O :} = 6;
@L2M{qw: P R S :} = 7;   # some define this as PQRS
@L2M{qw: T U V :} = 8;
@L2M{qw: W X Y :} = 9;   # some define this as WXYZ
   
sub format_phone {
   my $number = shift;
   $number =~ s/[a-zA-Z]/$L2M{uc($1)}/eg;
   $number =~ s/\D//g;       # maybe allow # and * later??

   if (defined($FORMAT_PHONE[length($number)-3])) {
      return sprintf($FORMAT_PHONE[length($number)-3], split(//, $numb
+er));
   }

   return;
}