Try this: m/(^\d+\s+\[.*\]).*(SNMP:\s+.*)$/

$1 will contain the indexnumber and the two IP's; $2 will contain the "SNMP:" plus string

Notice how the greediness of the regex-engine allows you to capture from the first [ to the last ] in one go.

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law