return numbers to string in js code example

Example 1: jquery extract number from string

var id_of_div = "div_id_12";
var id_number = parseInt(id_of_div.replace(/[^0-9.]/g, ""));
console.log(id_number);//12

Example 2: javascript find a digit in str

var regex = /\d+/g;
var string = "Any string you want!";
var matches = string.match(regex);  // creates array from matches

if (matches){
  // There is a digit in the string.
} else {
  // No Digits found in the string.
}