adding a comma to numeric value xml/perl

I have an xml variable in a script that hols a value like 2084. I want to convert it into 2,084. (put a comma in it) How do I do it?  Using Perl?

Thanks.
anup001Asked:
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TintinCommented:

$num =~ s/(^[-+]?\d+?(?=(?>(?:\d{3})+)(?!\d))|\G\d{3}(?=\d))/$1,/g;

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anup001Author Commented:
what is the input variable here?
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TintinCommented:
$num is the variable.

So if you have

my $num=2084;
$num =~ s/(^[-+]?\d+?(?=(?>(?:\d{3})+)(?!\d))|\G\d{3}(?=\d))/$1,/g;
print "Num is $num\n";

The output will be

Num is 2,084

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ozoCommented:
perldoc -q "How can I output my numbers with commas added"
Found inperlfaq5.pod
       How can I output my numbers with commas added?

       This subroutine will add commas to your number:

               sub commify {
                  local $_  = shift;
                  1 while s/^([-+]?\d+)(\d{3})/$1,$2/;
                  return $_;
                  }

       This regex from Benjamin Goldberg will add commas to numbers:

          s/(^[-+]?\d+?(?=(?>(?:\d{3})+)(?!\d))|\G\d{3}(?=\d))/$1,/g;

       It is easier to see with comments:

          s/(
              ^[-+]?            # beginning of number.
              \d{1,3}?          # first digits before first comma
              (?=               # followed by, (but not included in the match) :
                 (?>(?:\d{3})+) # some positive multiple of three digits.
                 (?!\d)         # an *exact* multiple, not x * 3 + 1 or whatever.
              )
             |                  # or:
              \G\d{3}           # after the last group, get three digits
              (?=\d)            # but they have to have more digits after them.
          )/$1,/xg;
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mjcoyneCommented:
Yet another method:
#!/usr/bin/perl -w
use strict;

my $number = "1234567.00";
$number = commify($number);

print "$number\n";

sub commify {
    my $input = shift;
    $input = reverse $input;
    $input =~ s<(\d\d\d)(?=\d)(?!\d*\.)><$1,>g;
    $input =  reverse $input;
    return $input;
}
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