Regex replace with the count of the match

I would like to replace a match with the number/index of the match. Is there way in java to know which match number the current match is, so I can use only `replaceAll(regex, replacement)` to inject the count of each match into the result? Example: Replace `[A-Z]` with itself and its index: ``` Input: fooXbarYfooZ Output: fooX1barY2fooZ3 ``` eg this: ``` "fooXbarXfooX".replaceAll("[A-Z]", "$0<some reference to the match count>"); ``` should return `"fooX1barY2fooZ3"` Note: I seek a replacement String within a single invocation of `replaceAll()` (or similar method) that does the entire job. Answers that use more than just a single method call, eg wrapping replacement operations in a `for` loop, do not answer the question.