On Sat, Sep 09, 2023 at 10:43:54PM +0100, Jeremy Harris via Exim-users wrote:
> >
> > $h_X-Spam-Potential:{{^(\\d+).*\$}{\$1}} is above 16
>
> That's written to be ambiguous, even with the questionable
> dounbled backslash (compare with your original):
Doubling of backslash, as well as "\$" is necessary because ${sg..}
expands all of its arguments, and this behaviour is documented with
proper examples.
It's really ambiguous, because ".*" may contain digits, but default
PCRE behaviour is preference of leading pattern in expansion loop.
I do not remember how this "greediness" may be changed (one should
study docs), but this variant works:
# exim4 -be '${sg{16}{^(\\d+).*\$}{\$1}}'
16
exim4 -be '${sg{16.45}{^(\\d+).*\$}{\$1}}'
16
--
Eugene Berdnikov
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