help with JavaScript

Question

how to replace a letter at the end of a word using regular expressions?

Answer 1

You Can use replace(/.$/, the new letter)

Answer 2

const replaceAll = (str, replace) => str.replaceAll(/[^\s.]\b/g, replace);
let rA = replaceAll('How Are You', '*');
console.log('replaceAll:', rA);

https://www.sololearn.com/compiler-playground/Wq9ZB566lZtm

Answer 3

if you know , please say me