code: public ListRegexMatchSetsResult withRegexMatchSets(RegexMatchSetSummary... regexMatchSets) {
          if (this.regexMatchSets == null) {
              setRegexMatchSets(new java.util.ArrayList<RegexMatchSetSummary>(regexMatchSets.length));
          }
          for (RegexMatchSetSummary ele : regexMatchSets) {
              this.regexMatchSets.add(ele);
          }
          return this;
      }
docs: <p>
  An array of <a>RegexMatchSetSummary</a> objects.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setRegexMatchSets(java.util.Collection)} or {@link #withRegexMatchSets(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param regexMatchSets
  An array of <a>RegexMatchSetSummary</a> objects.
  @return Returns a reference to this object so that method calls can be chained together.