A grammar is regular if and only if its rules are of the form X -> a or X -> aY, where X and Y are nonterminals and a is a terminal. Regular languages can be accepted by finite state automata.
Regular languages may also be defined using regular expressions, which consist of sets of string over a finite alphabet under the operations of union, concatenation and Kleene closure.
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A Wikipedia article on regular expressions with an informal discussion, a formal definition and examples.
The formal definition of regular expressions, also used to define regular languages.
Basic definitions of regular languages, how they are generated, closure properties, and comparison with context free languages.
This site gives a recursive definition of the class of regular languages, discusses its closure properties and gives examples.
A Wikipedia article on regular expressions with an informal discussion, a formal definition and examples.
This site gives a recursive definition of the class of regular languages, discusses its closure properties and gives examples.
Basic definitions of regular languages, how they are generated, closure properties, and comparison with context free languages.
The formal definition of regular expressions, also used to define regular languages.
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