> On Apr 7, 2018, at 1:59 AM, J Doe <[email protected]> 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.
--
Viktor.
