Test, validate and match regular expressions
This regex matches valid IPv4 host addresses (ranging from 1.0.0.1 to 254.255.255.254) paired with a specific port number (ranging from 0 to 65535). It rigorously validates each octet and the port number to ensure they fall within strict numerical boundaries. It is highly useful for extracting or validating IP:Port combinations found in network configurations, proxy lists, or server logs.