How to config intellij-idea not format some part of the code?

Question

In my version EAP 13.1, you must enable the following option in settings,

Preferences -> Code Style -> General -> Formatter Control -> Enable formatter markers in comments

before you can use these comments,

// @formatter:off

// @formatter:on

or these (depending on language):

<!--@formatter:off-->

<!--@formatter:on-->

Screenshot:

Screenshot highlighting the checkbox for Enable formatter markers in comments under Preferences