Regular expressions: new results and open problems

  • Authors:
  • Keith Ellul;Bryan Krawetz;Jeffrey Shallit;Ming-wei Wang

  • Affiliations:
  • Department of Computer Science, University of Waterloo, Waterloo, Ontario, Canada;Department of Computer Science, University of Waterloo, Waterloo, Ontario, Canada;Department of Computer Science, University of Waterloo, Waterloo, Ontario, Canada;Department of Computer Science, University of Waterloo, Waterloo, Ontario, Canada

  • Venue:
  • Journal of Automata, Languages and Combinatorics - Special issue: Selected papers of the fourth international workshop on descriptional complexity of formal systems
  • Year:
  • 2004

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Abstract

Regular expressions have been studied for nearly 50 years, yet many intriguing problems about their descriptive capabilities remain open. In this paper we sketch some new results and discuss what remains to be solved.