put dash after every n character during input from keyboard

Question

$(\'.creditCardText\').keyup(function() {
  var foo = $(this).val().split(\"-\").join(\"\"); // remove hyphens
  if (foo.length > 0) {
    foo = foo.match(new RegExp(         


        

Answer 1

You can split it using a regular expression. In this case, I'm using a expression to check for non-spaces with interval 3-2-4-3.

The RegExp.exec will return with a "match" array, with the first element containing the actual string. After removing the first element of the match, you can then join them up with dashes.

var mystring = "123121234123"
var myRegexp = /^([^\s]{3})([^\s]{2})([^\s]{4})([^\s]{3})$/g
var match = myRegexp.exec(mystring);
if (match)
{
    match.shift();
    mystring = match.join("-")
    console.log(mystring)
}