sql query with regexp instead IN and LIKE

regexp.sql

SELECT
    `w`.worker, `w`.time_with, `w`.time_to, `w`.foreman, `w`.object
  FROM `workers_days` AS `w`
  WHERE ( `worker` = 'Петров Игорь Васильвевич' ) 
  AND ( `year` = '2017' ) 
  AND ( `month` = '5' ) 
  AND ( `day` = '1' ) 
  AND ( `Пирожков_сорт` REGEXP '^4$|^4.1$' )