Skip to main content

On the semantics of atomic subgroups in practical regular expressions

1Citations
Citations of this article
2Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Most regular expression matching engines have operators and features to enhance the succinctness of classical regular expressions, such as interval quantifiers and regular lookahead. In addition, matching engines in for example Perl, Java, Ruby and .NET, also provide operators, such as atomic operators, that constrain the backtracking behavior of the engine. The most common use is to prevent needless backtracking, but the operators will often also change the language accepted. As such it is essential to develop a theoretical sound basis for the matching semantics of regular expressions with atomic operators. We here establish that atomic operators preserve regularity, but are exponentially more succinct for some languages. Further we investigate the state complexity of deterministic and non-deterministic finite automata accepting the language corresponding to a regular expression with atomic operators, and show that emptiness testing is PSPACE-complete.

Cite

CITATION STYLE

APA

Berglund, M., Van Der Merwe, B., Watson, B., & Weideman, N. (2017). On the semantics of atomic subgroups in practical regular expressions. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 10329 LNCS, pp. 14–26). Springer Verlag. https://doi.org/10.1007/978-3-319-60134-2_2

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free