How to make that regular expression for something like "1,3,5,2"?
<p>I'm trying to make a regex for this:</p>

<pre><code>1
1,1
1,1,1
1,1,1,1
</code></pre>

<p>the 1's could be any digit (0 to 9)</p>

<p>I guess it would be something like that:</p>

<pre><code>/^\d{1}+(,+\d{1})?+(,+\d{1})$/
</code></pre>

<p>But I don't know how to put that comma in the expression and to make sure there could be a maximum of 4 digits, separated by 3 commas. </p>
