Copied the code below. The else loop does the case sensitive (3rd parameter is 0) match but the comment says it's case insensitive match.


In Match.c file

/* Match a list representing users or groups. */
int
match_usergroup_pattern_list(const char *string, const char *pattern)
{
#ifdef HAVE_CYGWIN
	/* Windows usernames may be Unicode and are not case sensitive */
	return cygwin_ug_match_pattern_list(string, pattern);
#else
	/* Case insensitive match */
	return match_pattern_list(string, pattern, 0);
#endif
}