C strspn() Function

The function strspn() searches specified string in the given string and returns the number of the characters that are matched in the given string.

C strspn() declaration

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

str1 – The string in which the characters of string str2 are searched.
str2 – Another string, the characters of this string are searched in str1.

Return value of strspn()

It returns the count of the characters that are matched in the given string.

Example: strspn() function

#include <stdio.h>
#include <string.h>
int main () {
   int len; 
   const char str1[] = "abcdefgh"; 
   const char str2[] = "abXXcdeZZh";
   /* Searching the string str2 in the string str1.
    * It returns the count of characters of str2 that
    * are matched in the str1 
    */
   len = strspn(str1, str2);
   printf("Number of matched characters: %d\n", len );
   return 0;
}

Output:

Number of matched characters: 5

Related Posts:

1. C – strrchr() function
2. C – strncpy() function
3. C – strcoll() function
4. C – strcmp() function