PCRE2_SIZE len;
pcre2_substring_get_bynumber(md, matchnum,
(PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
+ if (!expand_nstring[expand_nmax])
+ { expand_nstring[expand_nmax] = US""; len = 0; }
expand_nlength[expand_nmax++] = (int)len;
}
expand_nmax--;