Run import according to flags.

MatchCaseInsensitive is to specify that whole value should match, but case-insensitive.

MatchDefault - same meaning as MatchExact.

MatchExact is to specify that whole value should match.

MatchLongestPrefix is to specify that prefix of value should match, and select the longest value from list of candidates.

MatchPrefix is to specify that prefix of value should match.

MatchRegexp is to specify that the group extracted from value should match.