Get the extension of file

fsdfsd

inverse match letters, numbers, and underscores

eee

This can be used to find all zone files that contain authoritative nameservers - e.g. perl -ne 'print if /^([\w.]+\.)\s+.+\sNS\s.+\1/' /var/named/*.db | awk '{print $1}' | sort | uniq

Remove repeated elements from a plain JSON array.

the tag must be a minumum of 3 characters long so we don't catch any BR, HR, etc.

Filter selfmon events by user and group using the r= switch. The full filter is entered as: r=/(?=.FULL SET USER1)(?=.Grp= 1)/ms

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