JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ivaynberg.github.com/select2/select2-master/select2.js"></script>
<link rel="stylesheet" href="http://ivaynberg.github.com/select2/select2-master/select2.css">
<select id="select2" name="select2" multiple class="select2" style="width: 300px;">
<option value="1">ABC</option>
<option value="2">BPS</option>
<option value="3">BPS</option>
<option value="4">HELP</option>
<option value="5">HELP</option>
<option value="6">EX</option>
<option value="7">HELP</option>    
</select>

<br /><br />

<input type="button" name="Button" id="selectspecify" value="Select String" />&nbsp;
<input size="50" name="selectstring" id="selectstring" value="" placeholder="Type in an option name">

JavaScript

$('#selectspecify').click(function() {
	var selectstring = $('#selectstring').val();
    var stringVal = [];
    $('#select2').find('option').each(function(){
        if($(this).is(':contains(' + selectstring + ')')){
                  stringVal.push($(this).val());
        }
        $('#select2').val(stringVal).trigger("change");
    });
});

$(".select2").select2();