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Integer to Money format

by vinoth.ree (Monsignor)
 on Jan 20, 2011 at 06:07 UTC Need Help??
vinoth.ree has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks

I have a integer number that should be represented as money format

Example:

INPUT:

4123456789

OUTPUT:

4,12,34,56,789

How to do it in regular expression?

The input length may increase!

Replies are listed 'Best First'.
Re: Integer to Money format
by happy.barney (Friar) on Jan 20, 2011 at 07:00 UTC
```my \$n = '4123456789';
\$n =~ s/(?<= \d )(?= (?:\d{2})* \d{3} \$ )/,/gx;

Thank you very much!

Re: Integer to Money format
by toolic (Bishop) on Jan 20, 2011 at 13:45 UTC
Whenever I see "format" and "number", I think of... Number::Format :)
```use warnings;
use strict;
use Number::Format qw(format_picture);

print format_picture(4123456789, '##,##,##,##,##,##,###'), "\n";

__END__

4,12,34,56,789
You could consider this as an alternative to regular expressions. One disadvantage is that format_picture forces you to know the upper bound on your number's length.
Re: Integer to Money format
by lyklev (Pilgrim) on Jan 20, 2011 at 08:06 UTC

That does not look like money format. The output would be

4,123,456,789

and possibly followed by a period and two digits for cents.

It is the Indian way of formatting money amounts. See: Indian Numbering System

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

Learned something today, thanks!
Re: Integer to Money format
by chrestomanci (Priest) on Jan 20, 2011 at 09:04 UTC

Was that a homework question? It looks a bit contrived to do it as a regular expression, when there alternative ways of inserting commas every three digits. For example:

```join(',', '4123456789' =~ m/.{3}/g )
did you mean something like this ? :-)
```scalar reverse join(',', (reverse '4123456789') =~ m/.{1,3}/g);
Re: Integer to Money format
by sundialsvc4 (Abbot) on Jan 20, 2011 at 15:05 UTC

When faced with a problem like that, I write a sub to do it. I fill that subroutine with comments, and I write the routine to be Perfectly Clear. Not Fast, not Short, and especially not Clever.

Oh really? Is that what You Do?

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