[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

Konstantin Belousov <kib@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib@FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
I beleieve that:
1. '+' must not be escaped by backslash, it becomes ordinary character to match
2. '+' only works as metasymbol for extended regexps, so you need REG_EXTENDED

BTW, why did you specified literal 4 as flag for regexec?

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