New answers tagged replace
1
If LITERAL is nil then you can use "\\&" in the replacement to represent the entire matched string, and so your replacement text could be "PREFIX\\&".
Refer to C-h f replace-match for the behaviour of LITERAL.
(And if you didn't want special characters in the replacement text to be processed, you would generally want LITERAL to be ...
2
Is this for interactive use? I suppose so. As the doc string for replace-regexp says:
This function is for interactive use only; in Lisp code
use `re-search-forward' and `replace-match' instead.
Are you really asking about replace-regexp, and not query-replace-regexp?
Because if you use the latter then the answer is included in Isearch by default: ...
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