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  Strict IPv4 Validator

  • IPv4 address networking

  /^((25[0-5]|(2[0-4]|1\d|[1-9])?\d)(?=\.\d|$)\.?){4}$/mg

  Matches only valid IPv4 IP addresses. Each octet is checked to make sure it is a digit 0-255. Leading zeroes are considered invalid because they can imply non-decimal format

  1.0.168.4 1.0.255.40 255.255.255.255 255.255.255.0 192.168.1.143 192.168.3.234 0.0.0.0

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