{{keywords>wiki library source code example reference}}
====== strcspn ======
<code c>
#include <string.h>
//#include <windows.h> /* uncomment this for Windows */

    size_t strcspn(const char *str1, const char *str2);
</code>

=== Description ===
strcspn find the first occurrence of any character in str2


===== strcspn C Example Code =====
<code c>
/* 
 * strcspn c example code
 * http://code-reference.com/c/string.h/strcspn 
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h> /* for strlen */
int main ( void )
{
  char string[] = "te=st@code-reference.com";
  char search_keys[] = "?! ,$%:;&/()=";
  size_t found;
  
  found = strcspn(string,search_keys);

  if (found > 0 && found < strlen(string)) {
          printf("is not a e-mail address found incorrect char at position: %i\n",  found );
     }
      else {
         printf("valid e-mail :)\n");
       }
  return 0;
}
</code>


=== Output of strcspn example ===
    user@host:~$ ./strcspn 
    is not a e-mail address found incorrect char at position: 2