Validate certain fields

[ocgsmi]

I amusing the form builder addon. I purchased it specifically so I could validate fields. I need to require zip+4 in the zip code field. How do I had that validation?

[wzp]

When you say “validate,” what exactly are you expecting?

1. Rejection of blank zip code field entries?
    
2. Force a 9 digit (as opposed to a 5 digit) zip code?
    
3. Validation for legitimate zip codes against the USPS database?

[Author]

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