Algorithms for finding patterns in strings
Handbook of theoretical computer science (vol. A)
Handbook of formal languages, vol. 1
Handbook of formal languages, vol. 1
Regular expressions with nested levels of back referencing form a hierarchy
Information Processing Letters
Programming Techniques: Regular expression search algorithm
Communications of the ACM
Polynomial Time Inference of Extended Regular Pattern Languages
Proceedings of RIMS Symposium on Software Science and Engineering
Finding patterns common to a set of strings (Extended Abstract)
STOC '79 Proceedings of the eleventh annual ACM symposium on Theory of computing
Mastering Regular Expressions
On Extended Regular Expressions
LATA '09 Proceedings of the 3rd International Conference on Language and Automata Theory and Applications
On the intersection of regex languages with regular languages
Theoretical Computer Science
Pattern expressions and pattern automata
Information Processing Letters
Complexity of multi-head finite automata: Origins and directions
Theoretical Computer Science
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We study different possibilities of combining the concept of homomorphic replacement with regular expressions in order to investigate the class of languages given by extended regular expressions with backreferences (REGEX). It is shown in which regard existing and natural ways to do this fail to reach the expressive power of REGEX. Furthermore, the complexity of the membership problem for REGEX with a bounded number of backreferences is considered.