regex only letters and spaces in end code example

Example 1: only letters and spaces regex

/^[a-zA-Z\s]*$/g

Example 2: regex for letters and spaces

/* Note this works with the onkeyup function in html with js */

function lettersandSpacesOnly(input){
    var regexs = /[^a-z ]*$/gmi;
    input.value = input.value.replace(regexs, "");
  }