var alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
console.log( alphabet.replace(/H.*S/, 'HS') )
Or just:
var alphabet = "ABCDEFGHSTUVWXYZ";
var alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
console.log( alphabet.replace(/H.*S/, 'HS') )
Or just:
var alphabet = "ABCDEFGHSTUVWXYZ";