Stateful aspects react to the history of a computation. Stateful aspect
developers define program execution patterns of interest to which aspects
react. Various stateful aspect languages have been proposed, each with
non-customizable semantics for matching a join point trace. For instance, most
languages allow multiple matches of a sequence when the associated context
information is different. Obtaining a different matching semantics requires ad
hoc modifications of the aspects, if at all possible. In order to allow
flexible customization of the matching semantics of a given aspect, this paper
presents a self-replication algorithm called MatcherCells. Through the
composition of simple reaction rules, MatcherCells makes it possible to express
a wide range of matching semantics, per aspect. In addition, we present an
initial implementation of our proposal.