Test, validate and match regular expressions
Detects markdown links whose visible link text looks like a URL (a domain with common TLDs like .com, .org, .io), e.g. https://bank.com. Useful for flagging deceptive 'fake' links in chat apps, forums, and moderation/spam filters, where the displayed domain may differ from the actual href destination — a classic phishing tactic. The g and m flags allow scanning every line of a document for matches.