Under camelcase search, "CoHM" (or CHM or CHas or ConHasMa etc) will match a camelcase identifier like ConcurrentHashMap. This is supported by popular IDEs and is extremely effective in searching Java APIs. If you are looking for a class/method like synchronizedList and being able to type "syL" gets you there much faster than having to type all of "synchronized" before you can differentiate between synchronize{List,Map,Set}.

Its seems fairly straightforward to implement; if you have a camelcase string XabcYdef, break it up at case boundaries, and convert into

    Xabc[lowercase]*Ydef[lowercase]*

and use that as your search regex instead of what the user entered.