Thank you for that piece of sagely advice. There is no direct
objection. Time is a factor. I honestly believe that management
would allow for such a study group, but while in the office - there
is always something hot. I am afraid that if they are not willing to
give up their lunch break or stay after hours, this just isn't going to
work. I am willing to make those sacrifices, how can I convince them
to do the same?
I doubt that you can (or necessarily should) convince your colleagues to give up their unpaid hours to learning perl to benefit the company, though it might be possible you could convince some to do so to benefit themselves - for the sake of having perl on their resume, or just to become a more effective programmer, or for the fun of it. But the people who would be swayed by such arguments would likely already be twisting your arm for a study group.
Talking to management is probably not the best first step (though this depends on the company), since it may result in management imposing your suggestions on reluctant colleagues, who are unlikely to thank you for it.
So I'd start by talking to your colleagues: do they see the lack of peer review of your code as a problem? Would they be happy to learn perl by going on a course? Would they be happy to learn from you inside work hours? Having learnt perl, could they imagine using it in the future, in another job? The answers to questions such as these would help clarify what to suggest to the management, or may convince you that you should do nothing.
Another approach is to teach by stealth: if you ever do code walkthroughs, try walking through some examples of your perl code, pointing out bugs and explaining how to fix them, and just describing what the language is doing as you go.
If you're management isn't going to allow some personal development time they're shooting themselves in the foot. They'll be heading towards higher staff turnover or poor quality employees in the longer term.
Giving up lunch breaks and staying after hours is a sacrifice. Personally I like to use them for eating lunch, seeing my partner and walking the dogs :-) Unless somebody is interested in perl for its own sake they are not going to sacrifice personal time. I don't think you can win that one.
I realise that this can be a hard problem to solve, but I think that your time will be better spent lobbying your management than your coworkers - that's where the problem is. You may be surprised. Asking works more often than you would expect, especially if you have sensible arguments for how the improved skills will help the company (as you do).