Test, validate and match regular expressions
This regex validates website URLs by matching an optional http/https protocol, an optional 'www.' prefix, a domain name of lowercase letters/digits, a TLD, and an optional second suffix or path (like .co.uk or /page). It's typically used in web form validation to verify user-entered website addresses. Note it has limitations: the dot in 'www.' is unescaped, and it won't match hyphenated domains or paths with special characters.