New for: D3, D4
and regular expressions. We will present regular expressions
corresponding to ECA and RECA. Conversely, by translating the regular
expressions of [ACM], we get "bracketed automata". By generalising them
slightly, we obtain "overlapping automata", a more declarative variant
of timed automata [AD]. Getting back to the world of regular
expressions, we get "overlapping regular expressions" corresponding to
timed automata [AD].