JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="inpt"/><br/>
<input type="radio" name="group1" id="plate" value="Plate"> Plate<br>
<input type="radio" name="group1" id="nonplate" value="NotPlate"> Not Plate

JavaScript

var rege = /^[A-Za-z]{2}\s?\d{5}$/;


$('#inpt').keyup(function(event) {
    if(rege.test($('#inpt').val())){ 
        $('#plate').Checked=true;
    } else {
        $('#nonplate').Checked=true;
    }

});