'!=': operator.ne,
}
operator_rex = re.compile(r'''(?x)\s*
- (?P<key>width|height|tbr|abr|vbr|asr|filesize|fps)
+ (?P<key>width|height|tbr|abr|vbr|asr|filesize|filesize_approx|fps)
\s*(?P<op>%s)(?P<none_inclusive>\s*\?)?\s*
(?P<value>[0-9.]+(?:[kKmMgGtTpPeEzZyY]i?[Bb]?)?)
$