code: public StrTokenizer setDelimiterMatcher(final StrMatcher delim) {
          if (delim == null) {
              this.delimMatcher = StrMatcher.noneMatcher();
          } else {
              this.delimMatcher = delim;
          }
          return this;
      }
docs: Sets the field delimiter matcher.
  <p>
  The delimiter is used to separate one token from another.
  
  @param delim  the delimiter matcher to use
  @return this, to enable chaining