I ma trying to match following exact format: '7b3bda24-31db-44d4-aa7f-7012b3594623' but without success.
var reg = new RegExp('/^([a-f0-9]{8})-(([a-f0-9]{4})-){3}([a-f0-9]{12})$/i');
document.getElementById('result').innerHTML = reg.test('7b3bda24-31db-44d4-aa7f-7012b3594623')
<p id="result"></p>