Are the numerical parts of $raw_value positive integers? If so, it's going to be simpler and (I suspect) more efficient to use capture groups and do the maths by hand. eg:

#!/usr/bin/env perl 
use strict;
use warnings;

my $raw_value = shift @ARGV;
my ($total_value, $base_value, $amount);
my $assets = {};
my $lookup_asset = 'foo';

  if ($raw_value && $raw_value =~ /(\d+)\*(\d+)/) {
    $total_value = $1 * $2; # performs multiplication
    ($amount, $base_value) = ($1, $2);
  }
  elsif ($raw_value && $raw_value =~ /(\d+)\/(\d+)/) {
    $base_value = $1 / $2; # performs division
    ($total_value, $amount) = ($1, $2);
  }
  else {
    $amount = $raw_value;
    $base_value = $assets->{$lookup_asset} ? $assets->{$lookup_asset} 
+: 0;
    $total_value = $amount * $base_value;
  }

print "Amount: $amount\nBase: $base_value\nTotal: $total_value\nRaw: $
+raw_value\n";

[download]

At least, that's how I would go about it.

In reply to Re^4: Perl::Critic says don't modify $_ in list functions and other things by hippo
in thread Perl::Critic says don't modify $_ in list functions and other things by Lady_Aleena

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.