OT

Filtering with Tcl/expect: 

#!/usr/bin/expect

while {[gets stdin line] >= 0} {
  if {[regexp {([[:xdigit:]]{2}:?){6}} $line]} {
    puts $line
  }
}

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In reply to Re^3: remove lines that do not match search pattern by pme
in thread remove lines that do not match search pattern by jasonwolf

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