Hi Viktor,

> On Apr 7, 2018, at 1:50 AM, Viktor Dukhovni <postfix-us...@dukhovni.org> 
> wrote:
>> On Apr 7, 2018, at 1:34 AM, J Doe <gene...@nativemethods.com> wrote:
>> mmm.  I just sent a test message via submission to a Gmail account and 
>> checked the headers and the replacement works.
>> According to the site [1]   \s is shorthand for POSIX regular expressions.
>> Perhaps the POSIX regex library compiled with Postfix now supports this ?
> No "\s" is not a POSIX feature, it is however a GNU extension, so you may have
> a GNU regexp library, that supports "\s" (outside bracket expressions):
>   https://www.regular-expressions.info/gnu.html

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 ?


- J


[1] https://packages.ubuntu.com/xenial/postfix 
[2] https://www.gnu.org/software/libc/manual/html_node/Regular-Expressions.html 

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