no. 2
Extending regular expressions with homomorphic replacement
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 44 (2010) no. 2, pp. 229-255.

We define H- 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 EDT0L languages. Moreover, relations to language families based on patterns, multi-patterns, pattern expressions, H-systems and uniform substitutions are also investigated. Furthermore, we present their closure properties with respect to TRIO operations and discuss the decidability status and complexity of fixed and general membership, emptiness, and the equivalence problem.

DOI : 10.1051/ita/2010013
Classification : 03D40, 68Q42, 68Q45
Mots clés : regular languages, homomorphic replacement, computational complexity 
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Bordihn, Henning; Dassow, Jürgen; Holzer, Markus. Extending regular expressions with homomorphic replacement. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 44 (2010) no. 2, pp. 229-255. doi : 10.1051/ita/2010013. http://www.numdam.org/articles/10.1051/ita/2010013/

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