Regex for Nicaraguan postal codes is incorrect

[nielslange]

Nicaragua uses the ISO 3166-2 country code NI. The current regex for Nicaraguan postal codes is hosted on this GitHub repository:

/^((\d{4}-)?\d{3}-\d{3}(-\d{1})?)?$/

This pattern successfully validates:

• An empty string → Entire pattern is optional.
• 123-456 → Core 3-3 pattern.
• 1234-123-456 → Optional 4-digit prefix.
• 123-456-7 → Optional single-digit suffix.
• 1234-123-456-7 → Includes all optional parts.

However, according to codigo-postal.org and en.youbianku.com, Nicaraguan postal codes consist of 5 digits and never start with 0. grcdi.nl outlines the following specific number ranges for postal codes:

10-16, 21-22, 25-27, 31-32, 34-35, 37-38, 41-48, 51-52, 55-56, 61-62, 65-66, 71-72, 81-82, 91-92

And suggests this regex:

\A((10|11|12|13|14|15|16|21|22|25|26|27|31|32|34|35|37|38|41|42|43|44|45|46|47|48|51|52|55|56|61|62|65|66|71|72|81|82|91|92)\d{3,3})\Z

I recommend updating the Nicaraguan postal code regex for more accurate validation.

[melwynfurtado]

Thanks for researching Nicaraguan postcodes. Can you optimise your regex for the first two digits as I see the first digit can be 1-9 and the second digit 1-8?
Also, please raise a PR. 🙏

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