I've been attempting to use the re_extract() function quite a bit lately
to write some simple "filters" for notification purposes. I struggled
with the syntax for a while until I realized tha the and have been
struggling quite a bit with the regex support for the re_extract()
function. According to the http://www.rsyslog.com/regex/ page (and the
re_extract function doc), Rsyslog uses POSIX ERE and "optionally" BRE
expressions.
* Does anyone have a good guide or reference for the syntax needed?
* How do you switch the regex type from ERE to BRE? At at glance it
appears that the BRE format is more cumbersome, so I want to make sure
that I don't unintentionally switch that mode on somehow.
I found the differences between the two briefly described on this page:
https://en.wikibooks.org/wiki/Regular_Expressions/POSIX-Extended_Regular_Expressions
Does Rsyslog have complete support for ERE expressions? In other words,
if I find a guide which covers ERE thoroughly, is that sufficient or are
there gaps in rsyslog's support for the ERE syntax that I should be
aware of?
Thanks.
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