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Title:

Extending Regular Expressions with Homomorphic Replacement

Document type:
Technical Report
Author(s):
Henning Bordihn; Juergen Dassow; Markus Holzer
Abstract:
We define H-expressions and EH-expressions as extensions of regular expressions by adding homomorphic and iterated homomorphic replacement as new operations, resp. The definition is analogous to the extension given by Gruska in order to characterize context-free languages. We compare the families of languages obtained by these extensions with the families of regular, linear context-free, context-free, and ETT0L languages. Furthermore, we present their closure properties with respect to TRIO oper...     »
Keywords:
Regular Expressions; Homomorphic Replacement; Formal Languages; Decision Problems
Year:
2001
Year / month:
2001-08-01 00:00:00
Pages:
28
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