<form id="form" method="post" action="">
		<label for="serial">Enter Serial Number</label>
		<input id="serial" name="serial" type="text" placeholder="e.g. SHDF3884-AEUR-D374-XXXX-XXXXXXXX" maxlength="32" />
		<small>Alphanumeric. Dashes will be added automatically.</small>
</form>

html {
  box-sizing: border-box;
	font-family: 'PT Sans', sans-serif;
-webkit-font-smoothing: antialiased;
}
*, 
*:before, 
*:after {
  box-sizing: inherit;
}
body {
	background-color: #f3f3f3;
}
form {
	width: 100%;
	max-width: 700px;
	margin: 60px auto;
}
form input {
	font-size: 30px;
	padding: 0 20px;
	border: 2px solid #ccc;
	width: 100%;
	color: #666;
	line-height: 3;
	border-radius: 7px;
	font-family: 'PT Sans', sans-serif;
	font-weight: bold;
}
form input:focus {
	outline: 0;
}
form input.error {
	border-color: #ff0000;	
}
form label.error {
	background-color: #ff0000;
	color: #fff;
	padding: 6px;
	font-size: 11px;
}

label {
	color: #999;
	display: block;
	margin-bottom: 10px;
	text-transform: uppercase;
	font-size: 18px;
	font-weight: bold;
	letter-spacing: 0.05em
}

form small {
	color: #888;
	font-size: 1em;
	margin-top: 10px;
	display: block;
	align-self: ;
}

(function($, undefined) {

	"use strict";

	// When ready.
	$(function() {
		
		var $form = $( "#form" );
		var $input = $form.find( "input" );

		$input.on( "keyup", function( event ) {
			
			
			// When user select text in the document, also abort.
			var selection = window.getSelection().toString();
			if ( selection !== '' ) {
				return;
			}
			
			// When the arrow keys are pressed, abort.
			if ( $.inArray( event.keyCode, [38,40,37,39] ) !== -1 ) {
				return;
			}
			
			var $this = $(this);
			var input = $this.val();
					input = input.replace(/[\W\s\._\-]+/g, '');
				
				var split = 4;
				var chunk = [];

				for (var i = 0, len = input.length; i < len; i += split) {
					split = ( i >= 8 && i <= 16 ) ? 4 : 8;
					chunk.push( input.substr( i, split ) );
				}

				$this.val(function() {
					return chunk.join("-").toUpperCase();
				});
		
		} );
		
		/**
		 * ==================================
		 * When Form Submitted
		 * ==================================
		 */
		$form.on( "submit", function( event ) {
			
			var $this = $( this );
			var arr = $this.serializeArray();
		
			for (var i = 0; i < arr.length; i++) {
					arr[i].value = arr[i].value.replace(/[($)\s\._\-]+/g, ''); // Sanitize the values.
			};
			
			console.log( arr );
			
			event.preventDefault();
		});
		
	});
})(jQuery);