Example: Matching URLs with a Specific Domain

Suppose you want to match URLs that belong to the domain example.com. The following regex pattern will do the trick:

    ^https?:\/\/(www\.)?example\.com(?:\/.*)?$

Explanation:

    ^: Start at the beginning of the URL.
    https?: Match either http or https (the 's' is optional).
    :\/\/: Match the :// that follows the protocol.
    (www\.)?: Match www. if it's present (optional).
    example\.com: Match the domain example.com (the . is escaped to be treated as a literal).
    (?:\/.*)?: Match any path if it's present (optional).
    $: End at the end of the URL.