RegexdrillSKU codes
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
The whole line must match. A SKU is three capital letters, a hyphen and four digits, optionally followed by a hyphen and a size: XS, S, M, L or XL.
What this exercise teaches
[A-Z]{3}-\d{4}(?:-(?:XS|S|M|L|XL))? allows only the five listed sizes.
A hint if you get stuck
List the sizes as alternatives inside an optional group that starts with the hyphen.
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