Who had the best regular season in the contest won by Arkansas-Pine Bluff?
CREATE TABLE "table1_22645714_5" (
  "conference" text,
  "regular_season_winner" text,
  "conference_player_of_the_year" text,
  "conference_tournament" text,
  "tournament_venue_city" text,
  "tournament_winner" text
);
SELECT "regular_season_winner" FROM "table1_22645714_5" WHERE "tournament_winner"='Arkansas-Pine Bluff';