Abstract. In this paper we extend the work of Campeanu, Salomaa and Yu [1] on extended regular expressions featured in the Unix utility egrep and the popular scripting language Perl. We settle the open issue of closure under intersection and provide an improved pumping lemma that will show that a larger class of languages is not recognizable by extended regular expressions. We also investigate some questions regarding extended multi-pattern languages introduced by Nagy in [2].

Experimental results are presented from an SDN/NFV testbed with automated, dynamically provisioned, 125 km optical WAN. Live VM migration for NFV video serving is demonstrated, along with Layer 0-3 orchestration using Open Daylight, OpenFlow, and DOVE.