Only match an exact string. Useful with `RegExp#test()` to check if a string is an IP address. *(`false` matches any IP address in a string)*
readonly exact?: boolean;
Include boundaries in the regex. When `true`, `192.168.0.2000000000` will report as an invalid IPv4 address. If this option is not set, the mentioned IPv4 address would report as valid (ignoring the trailing zeros).