RegexdrillUS ZIP and ZIP+4
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. Match a five-digit ZIP code, optionally followed by a hyphen and four more digits.
What this exercise teaches
\d{5}(?:-\d{4})? allows 90210 and 12345-6789 but nothing in between.
A hint if you get stuck
Make the hyphen and the four digits one optional group.
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