regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
/* Precompile the regular expression that is used for matching an SMTP error
regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
/* Precompile the regular expression that is used for matching an SMTP error