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Asked: 2026-06-05T05:05:27+00:00

I can’t seem to figure out what reg. expr. notation fits my needs: I

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I can’t seem to figure out what reg. expr. notation fits my needs:

I have wrapped some debugging code in DEBUG() macros…

so for example to print some debug output in log level 1 i use the following bits of code:

DEBUG_LVL_1(printf("some text");)

This is not always and everywhere the case though – sometimes I have the printf statements without a macro wrapper.
I want to do a search and replace for those case… i.e. where there is NO DEBUG_LVL_ macro , but there exist a printf statement…

how do I do that?

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1 Answer

  1. Editorial Team

    If lookaheads are supported in your language/tool of choice you can use

    ^(?!.*DEBUG_LVL_1).*printf

    (?!^.*DEBUG_LVL_1) is a negative lookahead assertion, this will fail if DEBUG_LVL_1 is found somewhere in the string.

    So this regex will match printf, but only if there is no DEBUG_LVL_1 somewhere in the same row.

    See it here on Regexr

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