NULL_UCHARP       668 regexec.c      #define STACK_PUSH_POS(s,sprev,keep)         STACK_PUSH(STK_POS,NULL_UCHARP,s,sprev,keep)
NULL_UCHARP      1203 regexec.c        UChar *ss, *p, *pstart, *pend = NULL_UCHARP;
NULL_UCHARP      1221 regexec.c      	  if (pend != NULL_UCHARP) {
NULL_UCHARP      3027 regparse.c       return NULL_UCHARP;
NULL_UCHARP      3306 regparse.c       name_end = NULL_UCHARP; /* no need. escape gcc warning. */