[Bug 254763] grep very slow with 13.0-RC4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254763

--- Comment #9 from parv <parv.0zero9+freebsd@gmail.com> ---
For not being noted earlier here, I will paraphrase Kyle Envans kaevans91 on
Twitter ...

- root issue is known in regex(3) library (see
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223553 also);
- grep(1) looks at each byte & for new lines;
- replacing regex(3) is a huge task, requires massive time & motivation.


... I would be happy to be corrected if I had misstated.


*In the mean time*, one could use instead ...

- ack, textproc/p5-ack (Perl), https://github.com/beyondgrep/ack3;

- ag, textproc/the_silver_searcher (C),
https://github.com/ggreer/the_silver_searcher;

- GNU grep, textproc/gnugrep (C), https://www.gnu.org/software/grep/;

- ripgrep, textproc/ripgrep (Rust), https://github.com/BurntSushi/ripgrep.


Other workaround option is to build system grep with one of external regex
libraries. For that matter, one could also install GNU grep at /usr/bin.

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