Regex To Add A Space After The Fourth Chars Javascript

I have a string which is a car number plate. But for display purposes I what to add a space after the fourth char in this string. The data comes from a data service so I have to do

Solution 1:

Simple and clear way to do this, without regex:

var$regtext = $('#regNumber');

if ($regtext.length > 0)
{
    var regtext = $regtext.text(),
    newRegtext = regtext.substr(0, 4) + " " + regtext.substr(4);
    console.log(newRegtext);
}

It's also pretty fast too: runs 10,000 times in 351ms, faster than splitting and joining etc. Good if you'll be processing loads of data from the webservice.

Solution 2:

You can use following jquery : Demo

$('.test').keyup(function() {
  var foo = $(this).val().split(" ").join(""); 
  if (foo.length > 0) {
    foo = foo.match(newRegExp('.{1,4}', 'g')).join(" ");
  }
  $(this).val(foo);
});

Solution 3:

If you want to use regex the following should do it.

newRegtext = regtext.replace(/^(.{4})/,'$1 ')

Solution 4:

Try this code

    $(document).ready(function(e) {
    var$regtext = $('#regNumber');
    var$regtext = $regtext.text();
    if ($regtext.length > 0)
    {

regCheck = /^([A-Z1-9a-z]{1,4})([A-Z1-9a-z]*)$/;
regtext = regCheck.test($regtext);
  newRegtext = $regtext.replace(regCheck,"$1$2");
        alert(newRegtext);

    }
  });