js正则的括号,类型,通配符

 alert("12345678用正则把数字用逗号分开："+"12345678".replace(/(-?\d+)(\d{3})/,"$1,$2"));
 alert("test@126.com用正则分隔："+'test@126.com'.replace(/(.+)(@)(.*)/,"$3===$2===$1"));
 alert("手机号判断："+/1[3-9]\d{9}/.test(13136113809));