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