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Programming-Idioms

Set i to the first position of string y inside string x, if exists.

Specify if i should be regarded as a character index or as a byte index.

Explain the behavior when y is not contained in x.
New implementation

Type ahead, or select one

Explain stuff

To emphasize a name: _x → x

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Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
#include <string.h>
int i=(int)(x-strstr(x,y));