code: public void addGlobalVarMaskRegex(VarMaskRegex varMaskRegex) {
          // blank values are forbidden
          if(StringUtils.isBlank(varMaskRegex.getRegex())) {
              LOGGER.fine("addGlobalVarMaskRegex NOT adding null regex");
              return;
          }
          getGlobalVarMaskRegexesList().add(varMaskRegex);
      }
docs: Adds a regex at the global level.
  
  <p>If regex is blank (as defined per the Commons Lang
  library), then the pair is not added.</p>
  
  @since 2.9