Regex for validating mac address
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Note that while method as well, which will transform a matching MAC address into so called canonical format. Do not use this module directly, but load it via Regexp:: Common. This modules gives you regular expressions for various style IPv4, IPv6, and MAC (or ethernet) addresses. If conformant IP addresses are really wanted, this is the only type of solution that has any chance of being close to complete. The expression could be more complex to verify more things but this should work for most cases.When I saw the question, I just thought "I won't touch that with a ten-foot standard regexp pole". It will not match a preceding 0 since 010.1.12.1 is not a common way to write IP addresses. This expression will not match IP addresses with leading 0s.