$('#ESN_val').on('keyup', function () {
                var ESN = document.getElementById('ESN_val').value;
                if (/^[0-9A-F]{8}$/.test(ESN) && ESN.length == 8) {
                alert('valid ESN')
                }else{
                    'invalid ESN'
                }
            });

SELECT
tsp_filtered_data.Document_id,
tsp_filtered_data.ESN,
(**********Regular Expresseion********) AS ESN_status
FROM
tsp_filtered_data