Difference Between str.find() in C++ and matching algorithms like KMP etc. and strstr() in C ?

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What Is The Difference Between This STL Function and These KMP Algorithms…
and also function strstr() in c

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In general the answer will be: It depends on the implementation. For the gnu compiler you can look it up for yourself in the source code of gcc or glibc. I had a short look at the glibc version of strstr. They seem to use the naive algorithm for short strings and some kind of improved version of KMP for linger strings. So in essence if you’re just looking for a substring, there is no reason to implement something like KMP because the library version will be roughly as fast as yours.

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