[Bug 251775] bsdgrep: egrep regards '{foo}' as invalid regular expression

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251775

Yuri Pankov <yuripv at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |yuripv at FreeBSD.org

--- Comment #1 from Yuri Pankov <yuripv at FreeBSD.org> ---
It's not grep itself, it's our regex implementation.

POSIX says it's UB:

*+?{
    The asterisk, plus-sign, question-mark, and left-brace shall be special
except when used in a bracket expression. Any of the following uses produce
undefined results:
    - If a left-brace is not part of a valid interval expression

re_format(7) is free interpretation of the standard.

FWIW, the best way is to fix your regular expressions.

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