Using C-x q (kbd-macro-query), you can get an effect
similar to that of query-replace, where the macro asks you each
time around whether to make a change. While defining the macro,
type C-x q at the point where you want the query to occur. During
macro definition, the C-x q does nothing, but when you run the
macro later, C-x q asks you interactively whether to continue.
The valid responses when C-x q asks are SPC (or y),
DEL (or n), RET (or q), C-l and C-r.
The answers are the same as in query-replace, though not all of
the query-replace options are meaningful.
These responses include SPC to continue, and DEL to skip the remainder of this repetition of the macro and start right away with the next repetition. RET means to skip the remainder of this repetition and cancel further repetitions. C-l redraws the screen and asks you again for a character to say what to do.
C-r enters a recursive editing level, in which you can perform editing which is not part of the macro. When you exit the recursive edit using C-M-c, you are asked again how to continue with the keyboard macro. If you type a SPC at this time, the rest of the macro definition is executed. It is up to you to leave point and the text in a state such that the rest of the macro will do what you want.
C-u C-x q, which is C-x q with a numeric argument, performs a completely different function. It enters a recursive edit reading input from the keyboard, both when you type it during the definition of the macro, and when it is executed from the macro. During definition, the editing you do inside the recursive edit does not become part of the macro. During macro execution, the recursive edit gives you a chance to do some particularized editing on each repetition. See section Recursive Editing Levels.
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