replace-range Example const replaceReange = require('replace-range'); const result = replaceRange('aaabbbcccdddeee', [ [3, 6, text => `<p>${text}</p>`], [9, 12, text => `<i>${text}</i>`], ]); console.log(result); // aaa<p>bbb</p>ccc<i>ddd</i>eee