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I am trying to count characters in comments included in C code using Python and Regex, but no success. I can erase strings first to get rid of comments in strings, but this will erase string in comments too and result will be bad ofc. Is there any chance to ask by using regex to not match strings in comments or vice versa?
No, not really.
Regex is not the correct tool to parse nested structures like you describe; instead you will need to parse the C syntax (or the “dumb subset” of it you’re interested in, anyway), and you might find regex helpful in that. A relatively simple state machine with three states (CODE, STRING, COMMENT) would do it.