here is a working code, anyone can try
my $req = HTTP::Request->new(GET => 'https://www.google.com/finance/co
+nverter?a=3&from=USD&to=EUR');
$req->content_type('application/json');
my $re = $ua->request($req);
$re->content =~ m|<span class=bld>(.+?)</span>|i and $span = $1;
$ct = substr($1, 0, -6);
print $ct;
prints 2.77 according to the currency usd to euro
but when you try to put amount from string
$m = "3";
https://www.google.com/finance/converter?a=$m&from=USD&to=EUR
doesn;t work correctly
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