public function get_source_origin_regexp() {
		$origins = array(
			'eventbrite' => Tribe__Events__Aggregator__Record__Eventbrite::get_source_regexp(),
			'meetup'     => Tribe__Events__Aggregator__Record__Meetup::get_source_regexp(),
		);

		/**
		 * Allows external plugins to filter which are the source Regular EXP
		 *
		 * @since 4.6.18
		 *
		 * @param  array $origins Which origins already exist
		 */
		return apply_filters( 'tribe_aggregator_source_origin_regexp', $origins );
	}