public BePressArticleIterator(
     ArchivalUnit au, SubTreeArticleIterator.Spec spec, boolean isSection) {
   super(au, spec);
   String volumeAsString = au.getConfiguration().get(ConfigParamDescr.VOLUME_NUMBER.getKey());
   String journalAbbr = au.getConfiguration().get(ConfigParamDescr.JOURNAL_ABBR.getKey());
   if (isSection) {
     journalAbbr = journalAbbr + "/" + au.getConfiguration().get("journal_section");
   }
   // pick up issue level and lower (make (art)?[0-9]+ optional because a few au's have article
   // at issue level
   this.pattern =
       Pattern.compile(
           String.format(
               "/%s/((([^0-9]+/)?(vol)?%s/(iss)?[0-9]+(/(art)?[0-9]+)?)|(vol%s/(?-i:[A-Z])[0-9]+))$",
               journalAbbr, volumeAsString, volumeAsString),
           Pattern.CASE_INSENSITIVE);
   this.TOC_pattern =
       Pattern.compile(
           String.format("/%s/([^0-9]+/)?(vol)?%s/(iss)?[0-9]+$", journalAbbr, volumeAsString),
           Pattern.CASE_INSENSITIVE);
 }