letters and numbers regex

regex.js

var letters = /^[A-Za-z]+$/;
var numbers = /^[0-9]+$/;

if(name.match(letters) && name.length <=15){
  alert("do something!");
}else{
  alert("Please Enter Name in Alphabet only...");
}

if(price.match(numbers) && price.length <=5){
  alert("do something!");
}else{
  alert("Please Enter Price in Number only...");
}