如何使用正则表达式与Eclipse的find/replace一起重构代码

I'm still developing my regex skills, so I'm leaning on the community. I say I want to refactor code "with Eclipse", but I've used a number of IDE's whose search and replace functions accept regular expressions. I've successfully create general expressions to find things, but wonder if I can take portions of the matched pattern and use in the replacement value. For example, I have a lot of test functions named with the following pattern" "testSomeFunction1(), testSomeFunction2(), testAnotherFunction()" I'd really like them to be named "test_someFunction1(), test_someFunction2(), test_anotherFunction()". The Find: is "test[A-Z]", but what do I use for Replace with:? "test_[a-z]" is literally replacing? Perhaps, I cannot use a regex statement in the replacement?I'm still developing my regex skills, so I'm le