strcspn: returns the index of the first character in *str1 that matches any of the characters in *str2 : strcspn « string.h « C / ANSI-C

1. C / ANSI-C
2. string.h
3. strcspn

strcspn: returns the index of the first character in *str1 that matches any of the characters in *str2

//Declaration:  size_t strcspn(const char *str1, const char *str2); 
//Return:       returns the index of the first character in *str1 that matches any of the characters in *str2. 

  #include <string.h>
  #include <stdio.h>

  int main(void)
  {
    int len;
    len = strcspn("this is a test", "ab");
    printf("%d", len);

    return 0;
  }

         
/*
8*/
           
       

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