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Lets say I called replaceAll() on a big string that replaced 1,000 matching instances. Does it mean that 1,000 strings were created and reassigned in process because of string immutability? Is there any faster alternatives?
If you dig into String, you’ll see that it delegates replaceAll() to Pattern & Matcher and Matcher.replaceAll() uses a StringBuilder to store the eventually returned value.
So no, String.replaceAll() does not create more than a small number of objects.