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https://issues.apache.org/jira/browse/VALIDATOR-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15957126#comment-15957126
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Matt Kusnierz commented on VALIDATOR-421:
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https://en.wikipedia.org/wiki/Dot-decimal_notation
> InetAddressValidator IPV4 rejects IPs with leading 0's in octets
> ----------------------------------------------------------------
>
> Key: VALIDATOR-421
> URL: https://issues.apache.org/jira/browse/VALIDATOR-421
> Project: Commons Validator
> Issue Type: Bug
> Components: Routines
> Affects Versions: 1.6
> Reporter: Matt Kusnierz
>
> According to Wikipedia "It [IPv4] also allowed the numbers to be written in
> hexadecimal and octal, by prefixing them with 0x and 0, respectively", but
> org.apache.commons.validator.routines.InetAddressValidator.isValidInet4Address(String)
> rejects IPs if an ipSegment starts with a leading 0.
> So leading 0's should be detected first, and then used to try and partInt
> using the octal radix.
> The ipv4 regex also doesn't support hex notation.
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