PHP (RegEx) Zip Code Validation

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This is a simple method of validating a 9-digit zip code using PHP and regular expressions

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  1. $string = "12345-1234";
  2. if (preg_match('/^[0-9]{5}([- ]?[0-9]{4})?$/', $string)) {
  3. echo "zip code checks out";
  4. }


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