Regular

Regular is a term with multiple senses in English and specialized fields. As an adjective, it denotes conformity to a standard or rule, ordinary, customary, or recurring at fixed intervals. It can also mean steady or predictable, and the noun form “the regular” can refer to a person who consistently attends a place or activity, a standard item, or a recurring customer. Etymology: from Latin regularis.

In mathematics and geometry, a regular polygon has all sides and interior angles equal; a regular polyhedron (a Platonic solid) has congruent faces and identical vertex figures. A regular grid has equal spacing and translational symmetry.

In computing, a regular expression (regex) is a formal language for pattern matching and text manipulation. In linguistics and grammar, a regular verb forms its past tense and past participle by a simple affix, typically -ed in English, unlike irregular verbs.

In daily life and commerce, regular can describe a usual schedule (regular hours), a regular price (as opposed to sale price), or a routine, habitual behavior. In broadcasting and sports, the term regular season distinguishes from playoffs or tournaments. Regular usage thus covers everyday language, mathematical structures, programming tools, and common social patterns, reflecting its core idea of standardization and repetition.