extract a value from a field in a file

Hello,

I need to extract from a file values of the "QRKPageBegin" field.
Into the file, the fields appear like following:
%%QRKPageBegin: 2
%%QRKPageBegin: 4
%%QRKPageBegin: 5

I would like to extract each of the values of this field, to set a list.

Actually, (I am a perl newbie), I wrote the following code

open (PS,$PSFile) or die "Could not open the file $PSFile: $! \n";
        $/ = "\r";

        while (<PS>) {
                while (/([%%QRKPageBegin\s]{14,})/g) {
                        print $1, "\n";
                }
        }
        close PS;

However it display/get the field but not the value, so any help would be greatly appreciated !

Best Regards,
Tof

.