[Bug 254763] grep very slow with 13.0-RC4

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

titus m <titus@edc.ro> changed:

           What    |Removed                     |Added
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                 CC|                            |titus@edc.ro

--- Comment #29 from titus m <titus@edc.ro> ---
Created attachment 265621
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=265621&action=edit
patch to libregex to fix slow ignore case matching

REG_ICASE matching is mega slow because the current code expands every
character in the search pattern to both cases 
ex a search -i for foobarbaz will generate an equivalent of 
[fF][oO][oO][bB][aA][rR][bB][aA][zZ]
this will prevent the subsequent code to create a "must" pattern and user
Boyer-Moore

the patch fixes it
i run the netbsd testcase against the patched version and it passed all
more details at
https://forums.freebsd.org/threads/fgrep-excessive-time-increase-after-upgrade-from-12-4-to-14-3-regex-library-issue.100124/#post-727610
onwords
the second patch posted on the forum is the same as here

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