Input field for bank account number
<p>I need to create form input field for inputing bank account number. Than number has <code>max</code> = 18 number and <code>min</code> 18 numbers. </p>

<p>algorithm is next  (3+13+2)</p>

<p>So i cant use clasic input text box i need special text box where i will have slash that separates that numbers like on screenshot:</p>

<p><a href="https://i.stack.imgur.com/BsOP3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BsOP3.png" alt="enter image description here"></a></p>

<p>How can i create textbox like above using <code>javascript</code> and <code>html</code></p>