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<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-1.9.1.min.js"></script>
  
<script src="http://ivaynberg.github.io/select2/select2-3.4.5/select2.js"></script>  
  
      <link href="//ivaynberg.github.io/select2/select2-3.4.5/select2.css" rel="stylesheet"/>
  
        <link href=" //netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet"/>
 
  
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  
 
<select id="sel" style="width: 100%">
    <option value="1">Hello</option>
    <option value="2">Friends &lt;i class='fa fa-check'>&lt;/i></option>
    <option value="3">Stackoverflow</option>
</select>
<br><br>
<button id="addok">Add <i class='fa fa-check'></i></button>
  <button id="removeok">Remove <i class='fa fa-check'></i></button>
  
 
  
</body>
</html>
 
$(document).ready(function () {
    
  
    $("#sel").select2({
        width: "100%",
            minimumResultsForSearch: -1,
            escapeMarkup: function(m) { return m; }
        });
    
    $("#addok").click(function() {
        actual_value = $("#sel").find(':selected').text();
        console.log($("#sel").find(':selected'))
      
        if (actual_value.indexOf(" <i class='fa fa-check'></i>") > -1){
            alert("asd");
            return;
        }
        
        newtext = actual_value + " <i class='fa fa-check'></i>";
        $("#sel").find(':selected').text(newtext).change();
    });
   
  $("#removeok").click(function() {
        
         actual_value= $("#sel").find(':selected').text(), indexOk =actual_value.indexOf(" <i class='fa fa-check'></i>");
        if (indexOk > -1){
              newtext =actual_value.substring(0, indexOk);
 $("#sel").find(':selected').text(newtext).change();
            return;
        }
​
    });
});
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