[Bug 255525] grep performance problem

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255525

--- Comment #4 from Duane <parakleta@darkreality.org> ---
Just out of interest I had a look around at the available regex libraries and I
think probably the way forward for base would be to update to the newer Henry
Spencer regex library from within the TCL codebase.

It's one of the smaller regex libraries around but uses NFA/DFA for speed.

I would propose using https://github.com/garyhouston/hsrex as a starting point
(this has been extracted from TCL by patching over the TCL dependencies).

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