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Regular Expression Matching: Review and Conversion Algorithms

Regular expressions (RE) provide an algebraic approach to defining languages. They are built using operators like concatenation, union, and closure. The process of converting an RE to an ε-NFA involves a special form automaton with specific states. Ken Thompson's pioneering work in this area, which won him the Turing Award, laid the foundation for efficient matching algorithms. Converting an RE to an ε-NFA allows for evaluating matches in linear time complexity. The construction steps involve adding a constant number of nodes and edges, resulting in an overall size of O(m). This approach enables efficient string matching using DFAs or ε-NFAs.

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Regular Expression Matching: Review and Conversion Algorithms

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