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<html xmlns:v="urn:schemas-microsoft-com:vml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Test</title>
</head>
<body>
<input id="inputbox" type="text" value="" />
<script>
var reg = /^([a-zA-Z\d])\1{3}(?:\.([a-zA-Z\d])\2{3})*$/g;
document.getElementById('inputbox').onchange = function(){
alert(reg.test(this.value));
}
</script>
</body>
</html>
var str = 'aaaa.bbbb.3333';
var re = /^(\w)\1{3}(\.(\w)\3{3})*$/i; //A~Z,a~z,0~9,_
alert(re.test(str))
alert(/^(.)\1{3}\.(.)\2{3}\.(.)\3{3}$/.test('1111.2222.3333'));//true
alert(/^(.)\1{3}\.(.)\2{3}\.(.)\3{3}$/.test('aaaa.bbbb.cccc'));//true
alert(/^(.)\1{3}\.(.)\2{3}\.(.)\3{3}$/.test('aaaa.bbbb.ccccc'));//false
alert(/^(.)\1{3}\.(.)\2{3}\.(.)\3{3}$/.test('aaaa.bbbb.ccck'));//false