code: public UpdateHealthCheckRequest withRegions(String... regions) {
          if (this.regions == null) {
              setRegions(new com.amazonaws.internal.SdkInternalList<String>(regions.length));
          }
          for (String ele : regions) {
              this.regions.add(ele);
          }
          return this;
      }
docs: <p>
  A complex type that contains one <code>Region</code> element for each region that you want Amazon Route 53 health
  checkers to check the specified endpoint from.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setRegions(java.util.Collection)} or {@link #withRegions(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param regions
  A complex type that contains one <code>Region</code> element for each region that you want Amazon Route 53
  health checkers to check the specified endpoint from.
  @return Returns a reference to this object so that method calls can be chained together.
  @see HealthCheckRegion