STR_OPERATORS = {
'=': operator.eq,
'!=': operator.ne,
+ '^=': lambda attr, value: attr.startswith(value),
+ '$=': lambda attr, value: attr.endswith(value),
+ '*=': lambda attr, value: value in attr,
}
str_operator_rex = re.compile(r'''(?x)
\s*(?P<key>ext|acodec|vcodec|container|protocol)