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 ? Thanks, - J Sources: [1] https://packages.ubuntu.com/xenial/postfix <https://packages.ubuntu.com/xenial/postfix> [2] https://www.gnu.org/software/libc/manual/html_node/Regular-Expressions.html <https://www.gnu.org/software/libc/manual/html_node/Regular-Expressions.html>
