[Bug 291172] regexp.h routines behave differently for my program and in the base grep

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291172

--- Comment #4 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Gleb Popov from comment #2)
Did you read re_format(7)?
     Obsolete (“basic”) regular expressions differ in several respects.  ‘|’
     is an ordinary character and there is no equivalent for its
     functionality.  ‘+’ and ‘?’ are ordinary characters, and their
     functionality can be expressed using bounds (‘{1,}’ or ‘{0,1}’
     respectively).

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