On 7 April 2018 at 07:04, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote:
> > > > On Apr 7, 2018, at 1:59 AM, J Doe <gene...@nativemethods.com> wrote: > > > > Ah, interesting - that must be it, then. > > > > This is on an Ubuntu 16.04 LTS server. I can see the dependencies > compiled in from Ubuntu’s page [1] and GNU libc is listed. [2] seems to > suggest that regular expressions are part of GNU libc. > > > > Is there another way I can confirm that ? > > FreeBSD 11 (POSIX): > > $ echo "1 b" | egrep '\d\s\w' > $ > > MacOS High Sierra (POSIX with GNU or similar extensions): > > $ echo "1 b" | egrep '\d\s\w' > 1 b > $ > > Your Ubuntu system most likely will match the MacOS results. Which means > that your regexp table is not portable, but happens to work on your system. On my Ubuntu 16.04.4: $ echo "1 b" | grep -E '\d\s\w' $ echo "1 b" | grep -E '[0-9]\s\w' 1 b But I agree OP should switch to using pcre tables, it is supported under Ubuntu.
