BP_Media_Extractor::extract_links( string $richtext, string $plaintext, array $extra_args = array() )

	protected function extract_links( $richtext, $plaintext, $extra_args = array() ) {
		$data = array( 'has' => array( 'links' => 0 ), 'links' => array() );

		// Matches: href="text" and href='text'.
		if ( stripos( $richtext, 'href=' ) !== false ) {
			preg_match_all( '#href=(["\'])([^"\']+)\1#i', $richtext, $matches );

			if ( ! empty( $matches[2] ) ) {
				$matches[2] = array_unique( $matches[2] );

				foreach ( $matches[2] as $link_src ) {
					$link_src = esc_url_raw( $link_src );

					if ( $link_src ) {
						$data['links'][] = array( 'url' => $link_src );
					}
				}
			}
		}

		$data['has']['links'] = count( $data['links'] );

		/**
		 * Filters links extracted from text.
		 *
		 * @since BuddyPress 2.3.0
		 *
		 * @param array  $data       Extracted links. See {@link BP_Media_Extractor::extract_links()} for format.
		 * @param string $richtext   Content to parse.
		 * @param string $plaintext  Copy of $richtext without any markup.
		 * @param array  $extra_args Bespoke data for a particular extractor.
		 */
		return apply_filters( 'bp_media_extractor_links', $data, $richtext, $plaintext, $extra_args );
	}