The pattern attribute in the <input> element is used to define a regular expression that the input value must match for it to be valid. The pattern \d{5} ensures that the data entered is either a five-digit zip code or an empty string (if the required attribute is not used).
* Pattern Explanation:
* \d{5}: Matches exactly five digits.
* This ensures that only a five-digit number or an empty string (if not required) is valid.
* Usage Example:
<input type="text" pattern="\d{5}" placeholder="Enter a 5-digit zip code"> This ensures that the input matches a five-digit zip code.
References:
* MDN Web Docs on pattern
* Regular Expressions Documentation