Mutation of Directed Graphs – Corresponding Regular Expressions and Complexity of Their Generation

Fevzi Belli
Mutlu Beyazit

Directed graphs (DG), interpreted as state transition diagrams, are traditionally used to represent finite-state automata (FSA). In the context of formal languages, both FSA and regular expressions (RE) are equivalent in that they accept and generate, respectively, type-3 (regular) languages. Based on our previous work, this paper analyzes effects of graph manipulations on corresponding RE. In this present, starting stage we assume that the DG under consideration contains no cycles. Graph manipulation is performed by deleting or inserting of nodes or arcs. Combined and/or multiple application of these basic operators enable a great variety of transformations of DG (and corresponding RE) that can be seen as mutants of the original DG (and corresponding RE). DG are popular for modeling complex systems; however they easily become intractable if the system under consideration is complex and/or large. In such situations, we propose to switch to corresponding RE in order to benefit from their compact format for modeling and algebraic operations for analysis. The results of the study are of great potential interest to mutation testing.

In Jürgen Dassow, Giovanni Pighizzini and Bianca Truthe: Proceedings Eleventh International Workshop on Descriptional Complexity of Formal Systems (DCFS 2009), Magdeburg, Germany, July 6-9, 2009, Electronic Proceedings in Theoretical Computer Science 3, pp. 69–77.
Published: 30th July 2009.

ArXived at: bibtex PDF

Comments and questions to:
For website issues: