Hello Akatsuki, and welcome to the Monastery!

It looks like your data may be in CSV (comma-separated values) format. If so, you will be better off (in the long run) to parse it with a dedicated module rather than a regular expression. For example, the following code uses Text::CSV_XS to read the values, then it doubles those which are decimal numbers but leaves the others unchanged:

use strict;
use warnings;
use Text::CSV_XS;

my $csv    = Text::CSV_XS->new({ allow_whitespace => 1 });
my $string = '"", "2.90", "3.00", "3.10", "3.20", "3.30", "3.40", "3.5
+0", ' .
         '"3.60", "3.70", "3.80", "3.90", "4.00", "4.10", "4.20", "5v"
+';

if ($csv->parse($string))
{
    my @fields = $csv->fields;
    /(\d+\.\d+)/ && ($_ *= 2) for @fields;
    print "$_\t" for @fields;
}
else
{
    $csv->error_diag();
}

[download]

Output:

 0:12 >perl 1707_SoPW.pl
        5.8     6       6.2     6.4     6.6     6.8     7       7.2   
+  7.4
7.6     7.8     8       8.2     8.4     5v
 0:12 >

[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Regex for multiple numbers between double quotes by Athanasius
in thread Regex for multiple numbers between double quotes by Akatsuki

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