〜（よ）うが〜まいが／〜（よ）うと〜まいと

Meaning

Indicates that whether one does it or not, the conclusion is unchanged. Places the affirmative and negative side by side, stating that either way is the same.

Examples

君が信じようが信じまいが、これは事実だ。 Whether you believe it or not, this is a fact.
雨が降ろうと降るまいと、試合は予定どおり行われる。 Whether it rains or not, the match will proceed as scheduled.