WP_Block_Type_Registry::register( string|WP_Block_Type $name, array $args = array() ): WP_Block_Type|false

48	public function register( $name, $args = array() ) {49		$block_type = null;50		if ( $name instanceof WP_Block_Type ) {51			$block_type = $name;52			$name       = $block_type->name;53		}54 55		if ( ! is_string( $name ) ) {56			_doing_it_wrong(57				__METHOD__,58				/* translators: %s: The received block type name type. */59				sprintf( __( 'Block type names must be strings, received %s.' ), gettype( $name ) ),60				'5.0.0'61			);62			return false;63		}64 65		if ( preg_match( '/[A-Z]+/', $name ) ) {66			_doing_it_wrong(67				__METHOD__,68				/* translators: %s: Block name. */69				sprintf( __( 'Block type names must not contain uppercase characters. "%s" was given.' ), esc_html( $name ) ),70				'5.0.0'71			);72			return false;73		}74 75		$name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/';76		if ( ! preg_match( $name_matcher, $name ) ) {77			_doing_it_wrong(78				__METHOD__,79				/* translators: %s: Block name. */80				sprintf( __( 'Block type names must contain a namespace prefix. Example: my-plugin/my-custom-block-type. "%s" was given.' ), esc_html( $name ) ),81				'5.0.0'82			);83			return false;84		}85 86		if ( $this->is_registered( $name ) ) {87			_doing_it_wrong(88				__METHOD__,89				/* translators: %s: Block name. */90				sprintf( __( 'Block type "%s" is already registered.' ), $name ),91				'5.0.0'92			);93			return false;94		}95 96		if ( ! $block_type ) {97			$block_type = new WP_Block_Type( $name, $args );98		}99 100		$this->registered_block_types[ $name ] = $block_type;101 102		return $block_type;103	}