strspn Function

It returns the index of the first character in *str1 that does not match any of the characters in *str2 .

Syntax:

  size_t strspn(const char *str1, const char *str2);

Example:

#include <string.h>

#include <stdio.h>

  int main()

  {

    int len;



    len = strspn("this is a test", "hi");

    printf("%d", len);



    return 0;

  }

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