[Nagiosplug-help] check_apt: I don't understand the regex

Frank Van Damme frank.vandamme at gmail.com
Wed Apr 6 13:31:54 CEST 2011

Hello list,

according to the man page of check_apt, a package is considered a
critical upgrade if it matches this regex:

^[^\(]*\([^ ]* (Debian-Security:|Ubuntu:[^/]*/[^-]*-security)

I know a few things about regexes but I can't parse it. And so can't grep:

# apt-get -o 'Debug::NoLocking=true' -s -qq upgrade | grep
 '^[^\(]*\([^ ]* (Debian-Security:|Ubuntu:[^/]*/[^-]*-security)'
grep: Unmatched ( or \(

What am I misinterpreting?

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