Regex for comma separated 3 letter words

Question

I want to create a regex for exactly 3 letter words only, separated by commas. 3 letter words can be padded with space(at most 1 on each side)

Valid Examples:

ORD
JFK, LAX
ABC,DEF, GHK,REW, ASD

Invalid Examples:

ORDA
OR
ORD,
JFK, LA

I tried the following but couldn't get it to work.

^(?:[A-Z ]+,)*[A-Z ]{3} +$ 

Answer 1

Try this pattern:

^[A-Z]{3}(?:[ ]?,[ ]?[A-Z]{3})*$

This pattern matches an initial three letter word, followed by two more terms separated by a comma with optional spaces.

Answer 2

Try this: ^([ ]?[AZ]{3}[ ]?,)*([ ]?[AZ]{3}[ ]?)+$

https://regex101.com/r/HFeN0D/2/

It matches at least one three letter word (with spaces), preceded by any number of words three letter words with commas after them.

Answer 3

You can do this with the pattern: ^((:? ?[AZ]{3} ?,)*(?: ?[AZ]{3} ?))+$

 var str = `ORD JFK, LAX ABC,DEF, GHK,REW, ASD ORDA OR ORD, JFK, LA`; let result = str.match(/^((:? ?[AZ]{3} ?,)*(?: ?[AZ]{3} ?))+$/gm); document.getElementById('match').innerHTML = result.join('<br>'); 

 <p id="match"></p>