man scan_charsetnskip () - skip characters from set
NAME
scan_charsetnskip - skip characters from set
SYNTAX
#include <scan.h>
long scan_charsetnskip(const char* src, const char* charset, unsigned long* limit);
DESCRIPTION
scan_charsetnskip returns the length of the maximum prefix of src that consists solely of characters that occur in charset (up to and not including the \0).