December 2023
Intermediate to advanced
242 pages
5h 28m
English
Content preview from Text Processing with JavaScript
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| Recipe 57 | Validating ZIP Codes |
Task
Suppose you run an online shop that is dedicated to delivering packages to customers as quickly as possible. So, you want to ensure the ZIP codes (postal codes used in the United States) entered by users conform to a standard format to prevent errors in mail delivery. The basic format of a ZIP code consists of five digits. But, there’s an extended ZIP+4 code which features the five digits of the ZIP code, followed by a hyphen and four digits that define a more precise location.
You aim to create a regular expression capable of matching input formats such as 12345, 12345-6789, and 12345 6789, while excluding 1234, 123456, 123456789, or 1234-56789.
Solution
Use the following function:
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