public RegexMatchSetUpdate withAction(ChangeAction action) {
        this.action = action.toString();
        return this;
    }
<p>
Specifies whether to insert or delete a <a>RegexMatchTuple</a>.
</p>

@param action
       Specifies whether to insert or delete a <a>RegexMatchTuple</a>.
@return Returns a reference to this object so that method calls can be chained together.
@see ChangeAction
aws-java-sdk-waf/src/main/java/com/amazonaws/services/waf/model/RegexMatchSetUpdate.java