Best way to mask textbox control to allow string value in a pair of 3 character using javascript
<p>I need to mask a textbox control to allow string value in a pair of 3 character using java script.</p>

<p>Eg:- I have a Text box control zip code in which when a user gives input then it should automatically pair them in a pair of 3 character (ABC#123), and total length of input is 6 Max.</p>

<p>Is it possible then how??</p>
