IP Address
egrep "^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
MAC address
egrep "^([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}$"
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