Perl doesn't see commas as being part of a number?

Given that it is a string that is less than suprising. In fact Perl tries its best to make a number out of the string - in fact it does find the number 1 (the bit before the first comma)..... 

C:\>perl -e "print '1,000,000' + 1000"
1001
C:\>

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What you see is a warning as Perl knows that effectively doing an atoi()ish thing on a string may give unexpected results. Just remove the commas first and re-add them for output. 

sub decommify { 
    my ( $number ) = @_;
    $number =~ tr/,//d;
  return $number
}

sub commify {
    my ( $number ) = @_;
  return undef unless $number;
    ( $number, my $dec ) = $number =~ m!([+-]?\d+)\.?(\d*)!;
  return undef unless $number;
    $number =~ s/(\d)(?=(\d{3})+(\D|$))/$1,/g if length($number) > 3;
  return $dec ? "$number.$dec" : $number;
}

print commify( decommify("1,000,001.123456789") + 1000 );

__DATA__
1,001,001.12345679

[download]

cheers

tachyon

In reply to Re: Numbers with commas by tachyon
in thread Numbers with commas by Anonymous Monk

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