I saw `substr($fromhost-ip,0,5)` example in the lookup_table functions'
offical document. But I can't find any documents about `substr` function
self.
When I use substr in my rsyslog.conf, the `rsyslogd -N1` testing command
return OK, but the result string always be null("").
So, is it a wrong example ,or an un-implement function now?
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