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There are times when you may want to use the 9 digit zip code validation for US. The 9 digit zip code is usually in format like this #####-####. For a 9 digit US zip code validation use below regular Expression. ^([0-9]{5}-[0-9]{4})$.
The DPVÂ® product identifies whether a ZIP + 4Â® coded address. is currently represented in the USPSÂ® delivery point file as a known address record. A CASS Certifiedâ¢ ZIP + 4 address-matching product matches and standardizes. addresses within a range of addresses. Incorporating DPV with the ZIP + 4 system.