Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="output"></pre>

JavaScript

var rege = /^[1-9][0-9]{3} ?(?!sa|sd|ss)[a-z]{2}$/i;
var out = document.getElementById('output');
out.innerText += rege.test('1234ab') + '\n'; // true
out.innerText += rege.test('1234 ab') + '\n'; // true
out.innerText += rege.test('0234 ab') + '\n'; // false
out.innerText += rege.test('1234 ss') + '\n'; // false

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JSFiddle - React, Tailwind, and code Playground

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