未捕获的SyntaxError：无效的正则表达式：/ ^（\ d {1} +（K | k）{0,1}）{0,1} $ /：无需重复

Question

我已经在aspx上运行但是

            function setAction()
        {           
            var idCheck = /^\w*$/;
            var bandwidthCheck = /^{\d{1}+(K|k){0,1}}{0,1}$/;

            if (document.video.eventID.value == '' || !idCheck.test(document.video.eventID.value)){
                alert("Please enter a valid Event ID");
                return false;               
            }
            else if (document.video.streamID.value == '' || !idCheck.test(document.video.streamID.value)){
                alert("Please enter a valid Stream ID");
                return false;               
            }
            else if (!bandwidthCheck.test(document.video.bandwidth.value)){
                alert("Please enter a valid Bandwidth");
                return false;               
            }               
            else if (document.video.file.value == ''){
                alert("Please select a media file");
                return false;
            }

        }

Uncaught SyntaxError：无效的正则表达式：/ ^（\ d {1} +（K | k）{0,1}）{0,1} $ /：无需重复 需要帮助