WP_Duotone::colord_parse_rgba_string( string $input ): array|null

302	private static function colord_parse_rgba_string( $input ) {303		// Functional syntax.304		$is_match = preg_match(305			'/^rgba?\(\s*([+-]?\d*\.?\d+)(%)?\s*,\s*([+-]?\d*\.?\d+)(%)?\s*,\s*([+-]?\d*\.?\d+)(%)?\s*(?:,\s*([+-]?\d*\.?\d+)(%)?\s*)?\)$/i',306			$input,307			$match308		);309 310		if ( ! $is_match ) {311			// Whitespace syntax.312			$is_match = preg_match(313				'/^rgba?\(\s*([+-]?\d*\.?\d+)(%)?\s+([+-]?\d*\.?\d+)(%)?\s+([+-]?\d*\.?\d+)(%)?\s*(?:\/\s*([+-]?\d*\.?\d+)(%)?\s*)?\)$/i',314				$input,315				$match316			);317		}318 319		if ( ! $is_match ) {320			return null;321		}322 323		/*324		 * For some reason, preg_match doesn't include empty matches at the end325		 * of the array, so we add them manually to make things easier later.326		 */327		for ( $i = 1; $i <= 8; $i++ ) {328			if ( ! isset( $match[ $i ] ) ) {329				$match[ $i ] = '';330			}331		}332 333		if ( $match[2] !== $match[4] || $match[4] !== $match[6] ) {334			return null;335		}336 337		return self::colord_clamp_rgba(338			array(339				'r' => (float) $match[1] / ( $match[2] ? 100 / 255 : 1 ),340				'g' => (float) $match[3] / ( $match[4] ? 100 / 255 : 1 ),341				'b' => (float) $match[5] / ( $match[6] ? 100 / 255 : 1 ),342				'a' => '' === $match[7] ? 1 : (float) $match[7] / ( $match[8] ? 100 : 1 ),343			)344		);345	}