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LETTERstrspnULETTER Counts the longest span of characters in a string.

Overview
#include <string.h>

index = strspn(s,chars);

size_t index;
const char *s;
const char *chars;

Portability
ANSI

Description
Returns the position of the first character in "s", which is not contained in "chars".

Returns
The position of the first character not in "chars".