Postal Code Validation Javascript Example

postal code validation javascript example for production applications

javascript

beginner

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Regular Expression

/^\d{5}(-\d{4})?$/

Explanation

This regex pattern validates postal code validation javascript example. Commonly used by developers for input validation and form checking.

Code Examples

JavaScript Example

javascript

// postal code validation javascript example - JavaScript
const regex = /^\d{5}(-\d{4})?$/;

function validate(input) {
  if (!input || typeof input !== 'string') return false;
  return regex.test(input.trim());
}

// Usage examples
console.log(validate('12345')); // true
console.log(validate('1234')); // false

Python Example

python

# postal code validation javascript example - Python
import re

pattern = r"^\d{5}(-\d{4})?$"
regex = re.compile(pattern)

def validate(input_str):
    if not input_str or not isinstance(input_str, str):
        return False
    return bool(regex.match(input_str.strip()))

# Usage examples
print(validate('12345'))  # True
print(validate('1234'))  # False

PHP Example

php

<?php
// postal code validation javascript example - PHP
function validate($input) {
    if (!is_string($input) || empty(trim($input))) {
        return false;
    }
    
    $pattern = '/^\d{5}(-\d{4})?$/';
    return preg_match($pattern, trim($input)) === 1;
}

// Usage examples
var_dump(validate('12345')); // bool(true)
var_dump(validate('1234')); // bool(false)
?>