Javascript正则匹配数字，中英文，中横线，下划线，utf-8中文

functioncheck_string(nickname){varreg=/^[A-Za-z0-9-_/u4e00-/u9fa5]{4,30}$/;if(!reg.test(nickname)){r

function check_string(nickname) {    var reg = /^[A-Za-z0-9-_/u4e00-/u9fa5]{4,30}$/;    if (!reg.test(nickname)) {        return false;    }    return true;}