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strspn
[find initial match]

    SYNOPSIS
    #include <string.h>
    size_t strspn(const char *s1, const char *s2);

DESCRIPTION
strspn computes the length of the initial segment of the string pointed to by s1 which consists entirely of characters from the string pointed to by s2 (excluding the terminating null character).

RETURNS
strspn returns the length of the segment found.

COMPLIANCE
strspn is ANSI C.

strspn requires no supporting OS subroutines.