25│ Regex::Regex(const char * regex, int flags)
26│ {
27│     auto errCode = regcomp(&exp, regex, flags);
28│     if (errCode != 0) {
29│         auto size = regerror(errCode, &exp, nullptr, 0);
30│         if (size) {
31│             std::string msg(size, '\0');
32│             regerror(errCode, &exp, &msg.front(), size);
33├───────────> throw LibraryException(errCode, msg);
34│         }
35│         throw LibraryException(errCode, "");
36│     }
37│ }

(gdb) p regex
$1 = 0x80046aace "^(\\S*)\\s*(<=|>=|<|>|=|==)?\\s*(\\S*)$"
(gdb) p errCode
$2 = 5