- A regex assembler optimizer. Give it a few regexes, have it assemble them into one large regex and optimize it. It's got to do better than just | or'ing all the regexes together. I've seen some work done on using trie variants to do this, but have no idea how far along the work is on this.

That should be unnecessary if your regex engine does the dfa transformation. basically, converts the regexp into a state machine and then it combines all of the branches in the state machine to generate synthetic states that can represent the "superposition" of matching multiple branches. this means your regex (once compiled) will run in bounded memory and max time proportional to the input (iirc)