My web is powered by Apache and PHP,its access log seems as blow,

xx.xx.xx.xx - - [12/Jul/2018:19:29:43 +0800] "GET /2018/07/06/antique-internet/ HTTP/1.1" 200 5489 "https://miscnote.net/"; "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36"

A perl script for stat purpose of this log:

tail -f /var/log/apache2/access.log|perl -nle 'next unless m{^(\S+) - - \[(\S+).*\] \"GET (.*?/)\s+}; printf "%-20s%-40s%-40s\n",$1,$3,$2'

I was totally confused about it.
 what does m{...} and its content stand for?
Can you help give a explain?

thanks in advance.

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