```js

[zhaikefeng]

function delStr(s = '', k = 2) {
            if (typeof s !== 'string' || k < 2) {
                return;
            }
            let c = new RegExp(`(.)\\1{${k-1}}`, 'g');
            while (s !== s.replace(c, '')) {
                s = s.replace(c, '');
            }

            return s;
     }

Originally posted by @huangd-d in #27 (comment)