martinsumner/leveled

keylist with regular expression

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martinsumner commented

Riak has the undocumented feature of being able to pass a regular expression into a $key (fold_keys) query. Leveled will support regex on index queries only, but in Riak with leveldb $key is itself an index query, not a seperate type of fold.

Need to extend keylist to take a regular expression for full backwards compatibility with the leveldb backend, and the indexes capability.