strcspn() - string.h

The C library function size_t strcspn(const char *str1, const char *str2) calculates the length of the initial segment of str1, which consists entirely of characters not in str2.

Syntax

size_t strcspn(const char *str1, const char *str2)

Example

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

int main ()
{
   int len;
   const char str1[] = "ABCDEF4960910";
   const char str2[] = "013";

   len = strcspn(str1, str2);

   printf("First matched character is at %d\n", len + 1);
   
   return(0);
}

Output / Return Value

First matched character is at 10

Limitations

Alternatives / See Also

Reference