strcspn - Compare strings and calculate segment length

Definition	#include <string.h> size_t strcspn(const char *s1, const char *s2); Starting at the beginning of string s1, strcspn calculates the length of the segment that does not contain a single character from string s2. The terminating null byte (\0) is not treated as part of string s2. As soon as a character in s1 matches a character in s2, the function is terminated and the segment length is returned. If the first character in s1 already matches a character in s2, the segment length is equal to 0.
Return val.	Integer	specifying the segment length (number of non-matching characters) starting from the beginning of string s1.
Note	Strings terminated with the null byte (\0) are expected as arguments
Example	#include <stdio.h> #include <string.h> int main(void) {  char text1[40];  static char text2[] = "/*#$&";  size_t n;  printf("Example of strcspn. Please enter a text line:\n");  scanf("%s",text1);  n = strcspn(text1, text2);  printf("Length of initial segment without /, *, #, $, &: %d\n", n);  return 0; }
See also	strspn