Validate PAN Number

Validate whether a given string is a valid Indian PAN card number.

javascript

function validatePanNumber(pan) {
  const panRegex = /^[A-Z]{5}[0-9]{4}[A-Z]{1}$/;
  const upperPan = pan.toUpperCase(); // Normalize to uppercase
  if (!panRegex.test(upperPan)) return false;
  const validFirstChars = ["C", "P", "H", "F", "A", "B", "G", "J", "L", "T"];
  return validFirstChars.includes(upperPan[0]);
}

javascript

validatePanNumber("ABCDE1234Z"); // true
validatePanNumber("PQRST1234Z"); // true
validatePanNumber("XYZZZ1234A"); // false (invalid first char)
validatePanNumber("ABCD12345Z"); // false (wrong pattern)
validatePanNumber("abcde1234z"); // true (normalized to uppercase)

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