Intersection of Regular Languages and Star Hierarchy

  • Authors:
  • Sebastian Bala

  • Affiliations:
  • -

  • Venue:
  • ICALP '02 Proceedings of the 29th International Colloquium on Automata, Languages and Programming
  • Year:
  • 2002

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Abstract

In this paper we consider the intersection-nonemptiness problem for languages given by regular expression without binary +. We prove that for regular expressions of star height 2 this problem is PSPACE-complete and it is NP-complete for regular expressions of star height at most 1.