正则表达式如何匹配6位数为这种数字格式？
123123
234234
345345
var aabbcc = /^(?:(\d)\1)+$/;
var ababab = /(\d{2})\1+$/;
var abcabc = /^(\d{3})\1+$/;
var aaabbb = /^(?:(\d)\1\1)+$/;/^(123|234|345|456|678|789)\1$/g
(\d{3})\1