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Exec block with regular expression

Can you explain what exactly happens in this block?
I don't get a clear explanation of what "xEF\xBB\xBF" means in the below code and why it is having drop ()? .

<Exec>
if $raw_event =~ /^(\xEF\xBB\xBF)?(date-time,|#)/ drop();
else
{
csv_parser->parse_csv();
$EventTime = parsedate(${date-time});
}
</Exec>

AskedApril 10, 2019 - 9:24pm
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how to get values extracted using regex?

Hello,

I'm quite new to nxlog, so forgive me if my question is  trivial but I'm having hard time to get the values I extract from my  logs using exec and a regex. I have a very large stash of old windows logs in text file (in multiline format), what I want to do is use nxlog to load them in graylog, but I want to format the log in a different way.

AskedAugust 31, 2015 - 4:17am