Perl RegEx conversion to 'Basic' -

i'm using grep in freebsd appears freebsd not support perl regex. i'm wondering version following have work in freebsd using 'basic' expression:

grep -po "(?<=addr.)[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*"

why not use perl - installed default.

perl -ne 'print $1 if m/(?<=addr.)([0-9]*\.[0-9]*\.[0-9]*\.[0-9]*)/'

of course @ point don't need behind more either.

perl -ne 'print join ("\n", m/addr.(\d+\.\d+\.\d+\.\d+)/)'

Camp