Search for pattern in variable with html-code in perl - regex

Question

I get a variable $response_code with the whole html-code of a website via curl. In this string I want so search via regex for a specific pattern. But this dosn't work, I get no match at all, no matter for what I search. When I write something different in $response_code it works, the array is empty...
Whats wrong with this?
use strict;
use warnings;
use WWW::Curl::Easy;
my $curl = WWW::Curl::Easy->new;
$curl->setopt(CURLOPT_HEADER,1);
$curl->setopt(CURLOPT_URL, 'https://fahrplaner.vbn.de/hafas/stboard.exe/dn?protocol=https:&input=8003760&boardType=dep&time=09$
# A filehandle, reference to a scalar or reference to a typeglob can be used here.
my $response_body;
$curl->setopt(CURLOPT_WRITEDATA,\$response_body);
# Starts the actual request
my $retcode = $curl->perform;
# Looking at the results...
if ($retcode == 0) {
# print("Transfer went ok\n");
my $response_code = $curl->getinfo(CURLINFO_HTTP_CODE);
# judge result and next action based on $response_code
# print("Received response: $response_body\n");
my #test = ($response_code =~ m/ontime/g);
print($test[0]);
}
else {
# Error code, type of error, error message
print("An error happened: $retcode ".$curl->strerror($retcode)." ".$curl->errbuf."\n");
}