I have to make a Regex reference that start with a group of three letters, followed by a hyphen and then a five-digit number.

to make a booking reference in the code I posted the code below

I only need the pattern fix

if (inputElement.id == "reference") { pattern = /^[a-zA-Z]d{3}[-\0-9]{5}$/;

this pattern is and example but is wrong I need to fix it so can accept the input below }

have to be able to submit in the app a input like ABC-12345