JS replaces all characters equal

Question

I’m trying to use the replace function to turn a letter to 0, but it doesn’t work when I want to test the letter inside a var.

var palavra = "abelha";
var letra = 'A';
palavra = palavra.replace(/(letra)/g, '0');

Some solution?

Answer 1

Can use new RegExp(padrão, flags), but you have to use the flag i also to ignore case sensitive (Do not differentiate between upper and lower case):

var palavra = "abelha";
var letra = 'A';
var re = new RegExp(letra, 'gi');
palavra = palavra.replace(re, '0');

console.log(palavra);