NULL_UCHARP       571 regexec.c      #define STACK_PUSH_POS(s,sprev)         STACK_PUSH(STK_POS,NULL_UCHARP,s,sprev)
NULL_UCHARP      1103 regexec.c        UChar *ss, *p, *pstart, *pend = NULL_UCHARP;
NULL_UCHARP      1121 regexec.c      	  if (pend != NULL_UCHARP) {
NULL_UCHARP      2867 regparse.c       return NULL_UCHARP;
NULL_UCHARP      3465 regparse.c     	  name_end = NULL_UCHARP; /* no need. escape gcc warning. */