Datatable column filtering

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/v/dt/jq-3.3.1/jszip-2.5.0/dt-1.10.20/af-2.3.4/b-1.6.1/b-colvis-1.6.1/b-flash-1.6.1/b-html5-1.6.1/b-print-1.6.1/cr-1.5.2/fc-3.3.0/fh-3.1.6/kt-2.5.1/r-2.2.3/rg-1.1.1/rr-1.2.6/sc-2.0.1/sp-1.0.1/sl-1.3.1/datatables.css">
<script src="https://cdn.datatables.net/v/dt/jq-3.3.1/jszip-2.5.0/dt-1.10.20/af-2.3.4/b-1.6.1/b-colvis-1.6.1/b-flash-1.6.1/b-html5-1.6.1/b-print-1.6.1/cr-1.5.2/fc-3.3.0/fh-3.1.6/kt-2.5.1/r-2.2.3/rg-1.1.1/rr-1.2.6/sc-2.0.1/sp-1.0.1/sl-1.3.1/datatables.js"></script>
<table id="example" class="display" style="width:100%">
        <thead>
            <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>🌳 Tiger Nixon</td>
                <td>System Architect</td>
                <td>Edinburgh</td>
                <td>61</td>
                <td>2011/04/25</td>
                <td>$320,800</td>
            </tr>
            <tr>
                <td>📰 Garrett Winters</td>
                <td>Accountant</td>
                <td>Tokyo</td>
                <td>63</td>
                <td>2011/07/25</td>
                <td>$170,750</td>
            </tr>
        <tfoot>
            <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </tfoot>
    </table>

JavaScript

$(document).ready(function() {
    $('#example').DataTable( {
    		columnDefs: [
        	{
          	targets: 0,
            render: function (data, type, row) {
            	if (type === 'sort') {
              	return data.replace(/.*? /,'');
              }
              return data;
            }
          }
        ],
        initComplete: function () {
            this.api().columns().every( function () {
                var column = this;
                var select = $('<select><option value=""></option></select>')
                    .appendTo( $(column.footer()).empty() )
                    .on( 'change', function () {
                        var val = $.fn.dataTable.util.escapeRegex(
                            $(this).val()
                        );
 
                        column
                            .search( val ? '^'+val+'$' : '', true, false )
                            .draw();
                    } );
 
                column.data().unique().sort().each( function ( d, j ) {
                    select.append( '<option value="'+d+'">'+d+'</option>' )
                } );
            } );
        }
    } );
} );