iHateRegex
Now you have two problems.
url
A valid URL with http/https
url slug
A ‘slug' is the part that comes at the very end of a URL, and refers to a specific page or post. Usually a combination of word that separated with hyphen
digital object identifier
A DOI is an identifier/handle used to identify objects uniquely
ssn
A Social Security number (SSN) is a nine-digit number that the U.S. government issues to all U.S. citizens and eligible U.S