# Date/time in header lines and SMTP responses
s/[A-Z][a-z]{2},\s\d\d?\s[A-Z][a-z]{2}\s\d\d\d\d\s\d\d\:\d\d:\d\d\s[-+]\d{4}
/Tue, 2 Mar 1999 09:44:33 +0000/gx;
+ # and in a French locale
+ s/\S{4},\s\d\d?\s[^,]+\s\d\d\d\d\s\d\d\:\d\d:\d\d\s[-+]\d{4}
+ /dim., 10 f\xE9vr 2019 20:05:49 +0000/gx;
# Date/time in logs and in one instance of a filter test
s/^\d{4}-\d\d-\d\d\s\d\d:\d\d:\d\d(\s[+-]\d\d\d\d)?\s/1999-03-02 09:44:33 /gx;
${perl{return_variable_vector}}
${sg{${perl{return_hash}}}{\\d+}{X}}
+this change-locale fails in earlier systems. Works on Fedora 29.
$tod_full // ${perl{change_locale}} // $tod_full
****
exim -d-all+expand -be
> 3
> X
>
-> Tue, 2 Mar 1999 09:44:33 +0000 // Changed locale // Tue, 2 Mar 1999 09:44:33 +0000
+> this change-locale fails in earlier systems. Works on Fedora 29.
+> Tue, 2 Mar 1999 09:44:33 +0000 // Changed locale // dim., 10 févr 2019 20:05:49 +0000
>
> Subroutine foo called with args: arg1
> Failed: Perl subroutine "foo_undef" returned undef to force failure