[perl #124256] Regex loop for \K in lookbehind

I bisected this, and it appears that this bug has been there from the very first, so this is not a regression:

ee9b8eaedac8053a01cc9281ada34dd182a8f7d0 is the first bad commit
commit ee9b8eaedac8053a01cc9281ada34dd182a8f7d0
Author: Yves Orton <demerphq@gmail.com>
Date:   Wed Jan 10 21:33:39 2007 +0100

    Add Regexp::Keep \K functionality to regex engine as well as add \v and \V, cleanup and more docs for regatom()
    Message-ID: <9b18b3110701101133i46dc5fd0p1476a0f1dd1e9c5a@mail.gmail.com>
    
    (plus POD nits by Merijn and myself)

-- 
Karl Williamson

---
via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=124256

• Re: [perl #124256] Regex loop for \K in lookbehind by ph10
• Re: [perl #124256] Regex loop for \K in lookbehind by demerphq
• Re: [perl #124256] Regex loop for \K in lookbehind by Karl Williamson
• Re: [perl #124256] Regex loop for \K in lookbehind by demerphq
• Re: [perl #124256] Regex loop for \K in lookbehind by Karl Williamson
• [perl #124256] Regex loop for \K in lookbehind by Karl Williamson via RT
• [perl #124256] Regex loop for \K in lookbehind by Karl Williamson via RT
• [perl #124256] Regex loop for \K in lookbehind by James E Keenan via RT