\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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等于 (\w)
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