Re: bash "extglob" needs to upgrade at least like zsh "kshglob"

[Martin D Kealey]

This seems like a good reason to simply translate extglobs into regexes,
which should run in linear time, rather than put effort into building and
debugging a parallel implementation.

-Martin

PS: While we're about it, can we please fix the expansion of « a/*/b/c/d/*
» so it only calls readdir on a/ and each dir matching a/*/b/c/d/ and NOT
call readdir on dirs matching a/*/, a/*/b/, or a/*/b/c/.