\1 等于 (\w)
var s = ‘aaabbbcccaaabbbaaabbbbbbbbbb‘;var a = s.split(‘‘);a.sort();s = a.join(‘‘);var pattern = /(\w)\1*/g;var ans = s.match(pattern);ans.sort(function(a, b) { return a.length < b.length;});;console.log(ans[0][0] + ‘: ‘ + ans[0].length);
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原文：https://www.cnblogs.com/chiangyibo/p/9501813.html