On Sat, Mar 18, 2023 at 5:39 PM Paul Eggert <egg...@cs.ucla.edu> wrote: > Thanks for looking into this. A couple of questions. > > First, some documentation issues. Why is PCRE2 incompatible with Perl on > this issue? Are there other areas where the two are incompatible?
To be honest, I was not too concerned about keeping up with Perl and am not worried about divergence, but admit I do not like the implication, given the name of the option: --perl-regexp. It's always been "pcre-regexp" in spirit. I suppose we'll want to document that, eventually. > Are > these incompatibilities documented anywhere? Is the goal for 'grep -P' > to be compatible with Perl, not with PCRE2? Doesn't Perl have the same issue? That's why the /a and /aa match modifiers were added. > Second, although that patch focuses on \d, doesn't \D have a similar > problem and shouldn't it be fixed too? Good point about \D. Will adjust.
