Regular expression in Theory of computation –its definition, examples and identities. By Mahak Jain, on November 14, 2018 Definition of regular expressionε also represents a Regular Expression which means the language contains a string that is empty. (L (ε) = {ε}) φ denotes an empty...
Definition wiki: A regular expression, regex or regexp(sometimes called a rational expression) is, in theoretical computer science and formal language theory, a sequence of characters that define a search pattern. Usually this pattern is then used by string searching algorithms for "find" or "fin...