Validator reports an error:
Bad value (?=^.{8,}$)(?=.*\d)(?=.*\W+)(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$ for attribute pattern on element input: Unterminated string constant.
Entire markup is:  <input type="password" name="clientPassword" id="clientPassword"  pattern='(?=^.{8,}$)(?=.*\d)(?=.*\W+)(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$' required>
The same markup validated last week, now reports an error with no change to the markup. The pattern contains no spaces, is not multi-line and is fully enclosed in quotes.