// remove non-letters from a string
function lettersOnly(str) {
return str.replace(/[^a-zA-Z]/g,"");
//or return str.match(/[a-z]/gi).join('');
//or return str.replace(/[^a-z]/gi,"");
}
console.log(lettersOnly("R!=:~0o0./c&}9k`60=y")); //"Rocky"
console.log(lettersOnly("^,]%4B|@56a![0{2m>b1&4i4")); //"Bambi"
console.log(lettersOnly("^U)6$22>8p).")); //"Up"