The word(s) "regular" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) Such as persevere in seeking their Lord's Countenance and are regular in prayer and spend of that which We bestow upon them secretly and openly, and overcome evil with good. Theirs will be the sequel of the (heavenly) Home,

(2) And stay in your houses. Bedizen not yourselves with the bedizenment of the Time of Ignorance. Be regular in prayer, and pay the poor-due, and obey Allah and His messenger. Allah's wish is but to remove uncleanness far from you, O Folk of the Household, and cleanse you with a thorough cleansing.