Filter divs by data-attr containing string

Question

How to filter a number of divs based on what they have in their custom data attribute using jQuery? The problem is that the attribute can have more than 1 values (which is treated as 1 string). So I need to work out if the data-att value contains a string.

<a href="">small</a>
<a href="">medium</a>
<a href="">large</a>

<div class="size" data-size="small">small tee</div>
<div class="size" data-size="small medium">small tee</div>
<div class="size" data-size="small medium">small tee</div>
<div class="size" data-size="small">small tee</div>
<div class="size" data-size="medium large">small tee</div>
<div class="size" data-size="medium large">small tee</div>

So if small link is clicked it should show only the divs whose data-size value contains small, so 'small' and 'small medium'.

I've tried:

$("a").click(function(e) {
    var selectSize = $(this).text();
    filter(selectSize)
            e.preventDefault();
});

function filter(e){
$('.tyre').hide()
    .filter('[data-sizes=""]:contains(' + e + ')')
    .show(); // show the filtered elements
}

but no go.

Answer 1

Arun P Johny's answer is perfect. I took his solution and tweak a little to make it more general.

You can use it to match part of the string, not just the whole word. Might come in handy in the future.

$("#filter").keyup(function(){
    var selectSize = $(this).val();
    filter(selectSize);
});

function filter(e) {
    var regex = new RegExp('\\b\\w*' + e + '\\w*\\b');
    $('.size').hide().filter(function () {
        return regex.test($(this).data('size'))
    }).show();
}

<input type='text' id='filter'>

<div class="size" data-size="small">small tee</div>
<div class="size" data-size="small medium">small medium tee</div>
<div class="size" data-size="small medium tee">small medium tee</div>
<div class="size" data-size="small">small tee</div>
<div class="size" data-size="medium large">medium large tee</div>
<div class="size" data-size="medium large">medium large tee</div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Or try this FIDDLE

Answer 2

To find the elements whose data-size attribute contain the string "small" you simply do this:

$(".size[data-size*='small']");

Answer 3

Try

function filter(e) {
    var regex = new RegExp('\\b' + e + '\\b');
    $('.size').hide()
        .filter(function () {
        return regex.test($(this).data('size'))
    }).show();
}

Demo: Fiddle