Limiting quantifier size for "efficiency and safety" reasons makes as much sense stopping the following loop
I wasn't proposing a limit on quantifier size, just observing that it's already present (and speculating on why).
Note that the "deep recursion" you are referring to is a warning, perl won't stop the recursion. But the Complex regular subexpression recursion limit makes perl just say "oh well, I had enough - I'll just pretend it doesn't match". That's wrong. It may even be exploitable.
Obviously I didn't read the perldiag page very well, despite linking to it. :-) Now I understand the difference—thanks. (Mainly I missed the fact that the regular expression match fails with a warning, rather than dieing, because I didn't actually run the code myself.)
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