public function register() {
		// Build the regex to be used only once.
		$regex_parts = array();

		foreach ( $this->attribute_blacklist as $key => $values ) {
			$values        = array_map( 'preg_quote', $values, array_fill( 0, count( $values ), '`' ) );
			$values        = implode( '|', $values );
			$regex_parts[] = sprintf( self::REGEX_ATTR_TEMPLATE, preg_quote( $key, '`' ), $values );
		}

		$this->favicon_regex = sprintf( self::REGEX_TEMPLATE, implode( '|', $regex_parts ) );

		return Tokens::$textStringTokens;
	}
public function register() {
		// Build the regex to be used only once.
		$regex_parts = array();

		foreach ( $this->attribute_blacklist as $key => $values ) {
			$values        = array_map( 'preg_quote', $values, array_fill( 0, count( $values ), '`' ) );
			$values        = implode( '|', $values );
			$regex_parts[] = sprintf( self::REGEX_ATTR_TEMPLATE, preg_quote( $key, '`' ), $values );
		}

		$this->favicon_regex = sprintf( self::REGEX_TEMPLATE, implode( '|', $regex_parts ) );

		return Tokens::$textStringTokens;
	}
Returns an array of tokens this test wants to listen for.

@return array