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      Google Interview Question

      Software Engineer Interview

      Write a regular expression to match a machine's MAC address

      Interview Answers

      Anonymous

      Sep 25, 2010

      The regex above is for an IP address, not a MAC address. One possible regex for a MAC address is ([0-9a-fA-F][0-9a-fA-F]:){5}([0-9a-fA-F][0-9a-fA-F])

      Anonymous

      Oct 21, 2010

      And if you're allowed to use Perl regex, you could flag case-insensitivity: /^([0-9A-F]{2}:){5}[0-9A-F]{2}$/i

      Anonymous

      Sep 22, 2010

      \b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b

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