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Regex 匹配有效IPv6地址的正则表达式

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Regex 匹配有效IPv6地址的正则表达式,regex,networking,ipv6,Regex,Networking,Ipv6,我在编写匹配有效IPv6地址的正则表达式时遇到问题，包括压缩形式的地址（每个字节对中省略了：或前导零） 有人能推荐一个满足要求的正则表达式吗 我正在考虑扩展每个字节对，并用一个更简单的正则表达式匹配结果。来自“”： 我不得不强烈支持他的回答 虽然您说需要一个正则表达式来匹配IPv6地址，但我假设您真正需要的是能够检查给定字符串是否是有效的IPv6地址。这里有一个微妙但重要的区别 有多种方法可以检查给定字符串是否为有效的IPv6地址，正则表达式匹配只是一种解决方案 如果可以，请使用现有库。该库将有

我在编写匹配有效IPv6地址的正则表达式时遇到问题，包括压缩形式的地址（每个字节对中省略了
：
或前导零）

有人能推荐一个满足要求的正则表达式吗

我正在考虑扩展每个字节对，并用一个更简单的正则表达式匹配结果。

来自“”：

我不得不强烈支持他的回答

虽然您说需要一个正则表达式来匹配IPv6地址，但我假设您真正需要的是能够检查给定字符串是否是有效的IPv6地址。这里有一个微妙但重要的区别

有多种方法可以检查给定字符串是否为有效的IPv6地址，正则表达式匹配只是一种解决方案

如果可以，请使用现有库。该库将有更少的bug，使用它将导致需要维护的代码更少

所建议的正则表达式既长又复杂。它最有可能奏效，但你也应该考虑如果意外失败，你会如何应对。我想在这里指出的一点是，如果您自己不能形成所需的正则表达式，您将无法轻松地调试它

如果您没有合适的库，那么最好编写自己的不依赖正则表达式的IPv6验证例程。如果你写了它，你就理解它，如果你理解它，你可以添加注释来解释它，这样其他人也可以理解并随后维护它

使用无法向其他人解释其功能的正则表达式时，请小心操作。

如果使用Perl，请尝试

听起来您可能正在使用Python。如果是这样，您可以使用以下内容：

import socket

def check_ipv6(n):
    try:
        socket.inet_pton(socket.AF_INET6, n)
        return True
    except socket.error:
        return False

print check_ipv6('::1') # True
print check_ipv6('foo') # False
print check_ipv6(5)     # TypeError exception
print check_ipv6(None)  # TypeError exception
我认为不必将IPv6编译成Python来获取，如果将
socket.AF\u INET
作为第一个参数传入，Python也可以解析IPv4地址。注意：这可能不适用于非Unix系统。

正则表达式允许在IPv4部分中使用前导零

一些Unix和Mac发行版将这些段转换为八进制

我建议使用
25[0-5]| 2[0-4]\d | 1\d\d |[1-9]？\d
作为IPv4段。

以下内容将验证IPv4、IPv6（完整和压缩）和IPv6v4（完整和压缩）地址：

'/^(?>(?>([a-f0-9]{1,4})(?>:(?1)){7}|(?!(?:.*[a-f0-9](?>:|$)){8,})((?1)(?>:(?1)){0,6})?::(?2)?)|(?>(?>(?1)(?>:(?1)){5}:|(?!(?:.*[a-f0-9]:){6,})(?3)?::(?>((?1)(?>:(?1)){0,4}):)?)?(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?4)){3}))$/iD'
在Java中，您可以使用库类
sun.net.util.IPAddressUtil
：

IPAddressUtil.isIPv6LiteralAddress(iPaddress);

此正则表达式将根据GEU-C++实现的有效的IPv6和IPv4地址，使用正则扩展模式： 

"^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(%.+)?\s*$"
使用Ruby？试试这个：

/^(((?=.*(::))(?!.*\3.+\3))\3?|[\dA-F]{1,4}:)([\dA-F]{1,4}(\3|:\b)|\2){5}(([\dA-F]{1,4}(\3|:\b|$)|\2){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})\z/i
我不是Ipv6专家，但我认为您可以更轻松地获得一个非常好的结果：

^([0-9A-Fa-f]{0,4}:){2,7}([0-9A-Fa-f]{1,4}$|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4})$
回答“是有效的ipv6”对我来说似乎没问题。把它分解成几个部分。。。算了吧。我省略了未指定的一个（：：），因为在我的数据库中没有“未指定的地址”的用处

开头： 
^（[0-9A-Fa-f]{0,4}:）{2,7}
一个简单的正则表达式将匹配，但我不建议进行任何类型的验证：

([A-Fa-f0-9]{1,4}::?){1,7}[A-Fa-f0-9]{1,4}
注意，这与地址中任何位置的压缩匹配，尽管它与环回地址：：1不匹配。为了保持正则表达式的简单性，我认为这是一个合理的折衷方案

我在iTerm2智能选择规则中成功地使用了这一点，四键单击IPv6地址。

如果您只需要普通IP-s（无斜杠），请点击此处：

我在hosts文件编辑器应用程序中将其用于语法高亮显示。很有魅力。

我无法得到@Factor Mystic的答案来处理POSIX正则表达式，所以我写了一个可以处理POSIX正则表达式和PERL正则表达式的答案

它应该匹配：

  • IPv6地址
  • 零压缩IPv6地址（）
  • 使用区域索引（）链接本地IPv6地址
  • IPv4嵌入IPv6地址（）
  • IPv4映射的IPv6地址（）
  • IPv4转换地址（）
IPv6正则表达式：

(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))
为便于阅读，以下是上面的正则表达式，在主要点处拆分为单独的行：

# IPv6 RegEx
(
([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|          # 1:2:3:4:5:6:7:8
([0-9a-fA-F]{1,4}:){1,7}:|                         # 1::                              1:2:3:4:5:6:7::
([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|         # 1::8             1:2:3:4:5:6::8  1:2:3:4:5:6::8
([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|  # 1::7:8           1:2:3:4:5::7:8  1:2:3:4:5::8
([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|  # 1::6:7:8         1:2:3:4::6:7:8  1:2:3:4::8
([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|  # 1::5:6:7:8       1:2:3::5:6:7:8  1:2:3::8
([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|  # 1::4:5:6:7:8     1:2::4:5:6:7:8  1:2::8
[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|       # 1::3:4:5:6:7:8   1::3:4:5:6:7:8  1::8  
:((:[0-9a-fA-F]{1,4}){1,7}|:)|                     # ::2:3:4:5:6:7:8  ::2:3:4:5:6:7:8 ::8       ::     
fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|     # fe80::7:8%eth0   fe80::7:8%1     (link-local IPv6 addresses with zone index)
::(ffff(:0{1,4}){0,1}:){0,1}
((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}
(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|          # ::255.255.255.255   ::ffff:255.255.255.255  ::ffff:0:255.255.255.255  (IPv4-mapped IPv6 addresses and IPv4-translated addresses)
([0-9a-fA-F]{1,4}:){1,4}:
((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}
(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])           # 2001:db8:3:4::192.0.2.33  64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address)
)

# IPv4 RegEx
((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])
为了使上述内容更易于理解，以下“伪”代码复制了上述内容：

IPV4SEG  = (25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])
IPV4ADDR = (IPV4SEG\.){3,3}IPV4SEG
IPV6SEG  = [0-9a-fA-F]{1,4}
IPV6ADDR = (
           (IPV6SEG:){7,7}IPV6SEG|                # 1:2:3:4:5:6:7:8
           (IPV6SEG:){1,7}:|                      # 1::                                 1:2:3:4:5:6:7::
           (IPV6SEG:){1,6}:IPV6SEG|               # 1::8               1:2:3:4:5:6::8   1:2:3:4:5:6::8
           (IPV6SEG:){1,5}(:IPV6SEG){1,2}|        # 1::7:8             1:2:3:4:5::7:8   1:2:3:4:5::8
           (IPV6SEG:){1,4}(:IPV6SEG){1,3}|        # 1::6:7:8           1:2:3:4::6:7:8   1:2:3:4::8
           (IPV6SEG:){1,3}(:IPV6SEG){1,4}|        # 1::5:6:7:8         1:2:3::5:6:7:8   1:2:3::8
           (IPV6SEG:){1,2}(:IPV6SEG){1,5}|        # 1::4:5:6:7:8       1:2::4:5:6:7:8   1:2::8
           IPV6SEG:((:IPV6SEG){1,6})|             # 1::3:4:5:6:7:8     1::3:4:5:6:7:8   1::8
           :((:IPV6SEG){1,7}|:)|                  # ::2:3:4:5:6:7:8    ::2:3:4:5:6:7:8  ::8       ::       
           fe80:(:IPV6SEG){0,4}%[0-9a-zA-Z]{1,}|  # fe80::7:8%eth0     fe80::7:8%1  (link-local IPv6 addresses with zone index)
           ::(ffff(:0{1,4}){0,1}:){0,1}IPV4ADDR|  # ::255.255.255.255  ::ffff:255.255.255.255  ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses)
           (IPV6SEG:){1,4}:IPV4ADDR               # 2001:db8:3:4::192.0.2.33  64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address)
           )
我在GitHub上发布了一个测试正则表达式的脚本：

当心在Java中，InetAddress和相关类（Inet4Address、Inet6Address、URL）的使用可能涉及网络流量例如DNS解析（URL.equals，字符串中的InetAddress！）。此呼叫可能需要很长时间，并且正在阻塞

对于IPv6，我有类似的东西。这当然不能处理IPv6非常微妙的细节，比如区域索引只允许在某些类别的IPv6地址上使用。这个正则表达式不是为组捕获而编写的，它只是一种“匹配”的正则表达式

S
-IPv6段=
[0-9a-f]{1,4}

I
-IPv4=
（？：（？：25[0-5]| 2[0-4][0-9]|[01]？[0-9]{1,2}）\{3}（？：25[0-5]| 2[0-4][0-9]|[01]？[0-9]{1,2}）

示意图（第一部分使用IPv4后缀匹配IPv6地址，第二部分匹配IPv6地址，最后一部分匹配区域索引）：

这里是may regex（不区分大小写，包含所需内容，如行的开头/结尾等）：

对于PHP5.2+用户，
filter\u var
非常有效

我知道这并没有回答最初的问题（特别是一个regex解决方案），但我发布这篇文章是希望它能在将来帮助其他人

$is_ip4address = (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== FALSE);
$is_ip6address = (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== FALSE);
这将适用于IPv4和IPv6：

^(([0-9a-f]{0,4}:){1,7}[0-9a-f]{1,4}|([0-9]{1,3}\.){3}[0-9]{1,3})$
你可以用我做的这个。它们基于regexp和grep

用法：

$ ifconfig | ipextract6
fe80::1%lo0
::1
fe80::7ed1:c3ff:feec:dee1%en0
看看其他答案中包含的模式，有许多好的模式可以通过引用组和使用lookaheads来改进。下面是一个自引用模式的示例，如果有必要，我会在PHP中使用该模式：

^(?<hgroup>(?<hex>[[:xdigit:]]{0,4}) # grab a sequence of up to 4 hex digits
                                     # and name this pattern for usage later
     (?<!:::):{1,2})                 # match 1 or 2 ':' characters
                                     # as long as we can't match 3
 (?&hgroup){1,6} # match our hex group 1 to 6 more times
 (?:(?:
    # match an ipv4 address or
    (?<dgroup>2[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3}(?&dgroup)
    # match our hex group one last time
    |(?&hex))$

^（？（[：xdigit:]{0,4}）获取最多4个十六进制数字的序列

IPV4SEG  = (25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])
IPV4ADDR = (IPV4SEG\.){3,3}IPV4SEG
IPV6SEG  = [0-9a-fA-F]{1,4}
IPV6ADDR = (
           (IPV6SEG:){7,7}IPV6SEG|                # 1:2:3:4:5:6:7:8
           (IPV6SEG:){1,7}:|                      # 1::                                 1:2:3:4:5:6:7::
           (IPV6SEG:){1,6}:IPV6SEG|               # 1::8               1:2:3:4:5:6::8   1:2:3:4:5:6::8
           (IPV6SEG:){1,5}(:IPV6SEG){1,2}|        # 1::7:8             1:2:3:4:5::7:8   1:2:3:4:5::8
           (IPV6SEG:){1,4}(:IPV6SEG){1,3}|        # 1::6:7:8           1:2:3:4::6:7:8   1:2:3:4::8
           (IPV6SEG:){1,3}(:IPV6SEG){1,4}|        # 1::5:6:7:8         1:2:3::5:6:7:8   1:2:3::8
           (IPV6SEG:){1,2}(:IPV6SEG){1,5}|        # 1::4:5:6:7:8       1:2::4:5:6:7:8   1:2::8
           IPV6SEG:((:IPV6SEG){1,6})|             # 1::3:4:5:6:7:8     1::3:4:5:6:7:8   1::8
           :((:IPV6SEG){1,7}|:)|                  # ::2:3:4:5:6:7:8    ::2:3:4:5:6:7:8  ::8       ::       
           fe80:(:IPV6SEG){0,4}%[0-9a-zA-Z]{1,}|  # fe80::7:8%eth0     fe80::7:8%1  (link-local IPv6 addresses with zone index)
           ::(ffff(:0{1,4}){0,1}:){0,1}IPV4ADDR|  # ::255.255.255.255  ::ffff:255.255.255.255  ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses)
           (IPV6SEG:){1,4}:IPV4ADDR               # 2001:db8:3:4::192.0.2.33  64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address)
           )



(
(
::(S:){0,5}|
S::(S:){0,4}|
(S:){2}:(S:){0,3}|
(S:){3}:(S:){0,2}|
(S:){4}:(S:)?|
(S:){5}:|
(S:){6}
)
I

|

:(:|(:S){1,7})|
S:(:|(:S){1,6})|
(S:){2}(:|(:S){1,5})|
(S:){3}(:|(:S){1,4})|
(S:){4}(:|(:S){1,3})|
(S:){5}(:|(:S){1,2})|
(S:){6}(:|(:S))|
(S:){7}:|
(S:){7}S
)

(?:%[0-9a-z]+)?



(?:
(?:
::(?:[0-9a-f]{1,4}:){0,5}|
[0-9a-f]{1,4}::(?:[0-9a-f]{1,4}:){0,4}|
(?:[0-9a-f]{1,4}:){2}:(?:[0-9a-f]{1,4}:){0,3}|
(?:[0-9a-f]{1,4}:){3}:(?:[0-9a-f]{1,4}:){0,2}|
(?:[0-9a-f]{1,4}:){4}:(?:[0-9a-f]{1,4}:)?|
(?:[0-9a-f]{1,4}:){5}:|
(?:[0-9a-f]{1,4}:){6}
)
(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9]{1,2})\.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9]{1,2})|

:(?::|(?::[0-9a-f]{1,4}){1,7})|
[0-9a-f]{1,4}:(?::|(?::[0-9a-f]{1,4}){1,6})|
(?:[0-9a-f]{1,4}:){2}(?::|(?::[0-9a-f]{1,4}){1,5})|
(?:[0-9a-f]{1,4}:){3}(?::|(?::[0-9a-f]{1,4}){1,4})|
(?:[0-9a-f]{1,4}:){4}(?::|(?::[0-9a-f]{1,4}){1,3})|
(?:[0-9a-f]{1,4}:){5}(?::|(?::[0-9a-f]{1,4}){1,2})|
(?:[0-9a-f]{1,4}:){6}(?::|(?::[0-9a-f]{1,4}))|
(?:[0-9a-f]{1,4}:){7}:|
(?:[0-9a-f]{1,4}:){7}[0-9a-f]{1,4}
)

(?:%[0-9a-z]+)?



$is_ip4address = (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== FALSE);
$is_ip6address = (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== FALSE);



^(([0-9a-f]{0,4}:){1,7}[0-9a-f]{1,4}|([0-9]{1,3}\.){3}[0-9]{1,3})$



$ ifconfig | ipextract6
fe80::1%lo0
::1
fe80::7ed1:c3ff:feec:dee1%en0



^(?<hgroup>(?<hex>[[:xdigit:]]{0,4}) # grab a sequence of up to 4 hex digits
                                     # and name this pattern for usage later
     (?<!:::):{1,2})                 # match 1 or 2 ':' characters
                                     # as long as we can't match 3
 (?&hgroup){1,6} # match our hex group 1 to 6 more times
 (?:(?:
    # match an ipv4 address or
    (?<dgroup>2[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3}(?&dgroup)
    # match our hex group one last time
    |(?&hex))$



(?=([0-9a-f]+(:[0-9a-f])*)?(?P<wild>::)(?!([0-9a-f]+:)*:))(::)?([0-9a-f]{1,4}:{1,2}){0,6}(?(wild)[0-9a-f]{0,4}|[0-9a-f]{1,4}:[0-9a-f]{1,4})



class IPv6
{
    public List<string> FindIPv6InFile(string filePath)
    {
        Char ch;
        StringBuilder sbIPv6 = new StringBuilder();
        List<string> listIPv6 = new List<string>();
        StreamReader reader = new StreamReader(filePath);
        do
        {
            bool hasColon = false;
            int length = 0;

            do
            {
                ch = (char)reader.Read();

                if (IsEscapeChar(ch))
                    break;

                //Check the first 5 chars, if it has colon, then continue appending to stringbuilder
                if (!hasColon && length < 5)
                {
                    if (ch == ':')
                    {
                        hasColon = true;
                    }
                    sbIPv6.Append(ch.ToString());
                }
                else if (hasColon) //if no colon in first 5 chars, then dont append to stringbuilder
                {
                    sbIPv6.Append(ch.ToString());
                }

                length++;

            } while (!reader.EndOfStream);

            if (hasColon && !listIPv6.Contains(sbIPv6.ToString()) && IsIPv6(sbIPv6.ToString()))
            {
                listIPv6.Add(sbIPv6.ToString());
            }

            sbIPv6.Clear();

        } while (!reader.EndOfStream);
        reader.Close();
        reader.Dispose();

        return listIPv6;
    }

    public List<string> FindIPv6InText(string text)
    {
        StringBuilder sbIPv6 = new StringBuilder();
        List<string> listIPv6 = new List<string>();

        for (int i = 0; i < text.Length; i++)
        {
            bool hasColon = false;
            int length = 0;

            do
            {
                if (IsEscapeChar(text[length + i]))
                    break;

                //Check the first 5 chars, if it has colon, then continue appending to stringbuilder
                if (!hasColon && length < 5)
                {
                    if (text[length + i] == ':')
                    {
                        hasColon = true;
                    }
                    sbIPv6.Append(text[length + i].ToString());
                }
                else if (hasColon) //if no colon in first 5 chars, then dont append to stringbuilder
                {
                    sbIPv6.Append(text[length + i].ToString());
                }

                length++;

            } while (i + length != text.Length);

            if (hasColon && !listIPv6.Contains(sbIPv6.ToString()) && IsIPv6(sbIPv6.ToString()))
            {
                listIPv6.Add(sbIPv6.ToString());
            }

            i += length;
            sbIPv6.Clear();
        }

        return listIPv6;
    }

    bool IsEscapeChar(char ch)
    {
        if (ch != ' ' && ch != '\r' && ch != '\n' && ch!='\t')
        {
            return false;
        }

        return true;
    }

    bool IsIPv6(string maybeIPv6)
    {
        IPAddress ip;
        if (IPAddress.TryParse(maybeIPv6, out ip))
        {
            return ip.AddressFamily == AddressFamily.InterNetworkV6;
        }
        else
        {
            return false;
        }
    }

}



private static final String IPV4_BASIC_PATTERN_STRING =
        "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}" + // initial 3 fields, 0-255 followed by .
         "([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"; // final field, 0-255

private static final Pattern IPV4_PATTERN =
    Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$");

private static final Pattern IPV4_MAPPED_IPV6_PATTERN = // TODO does not allow for redundant leading zeros
        Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$");

private static final Pattern IPV6_STD_PATTERN =
    Pattern.compile(
            "^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");

private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
    Pattern.compile(
            "^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields
             "::" +
             "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$"); // 0-6 hex fields 



libraryDependencies += "commons-validator" % "commons-validator" % "1.4.1"


import org.apache.commons.validator.routines._

/**
 * Validates if the passed ip is a valid IPv4 or IPv6 address.
 *
 * @param ip The IP address to validate.
 * @return True if the passed IP address is valid, false otherwise.
 */  
 def ip(ip: String) = InetAddressValidator.getInstance().isValid(ip)



"The `ip` validator" should {
  "return false if the IPv4 is invalid" in {
    ip("123") must beFalse
    ip("255.255.255.256") must beFalse
    ip("127.1") must beFalse
    ip("30.168.1.255.1") must beFalse
    ip("-1.2.3.4") must beFalse
  }

  "return true if the IPv4 is valid" in {
    ip("255.255.255.255") must beTrue
    ip("127.0.0.1") must beTrue
    ip("0.0.0.0") must beTrue
  }

  //IPv6
  //@see: http://www.ronnutter.com/ipv6-cheatsheet-on-identifying-valid-ipv6-addresses/
  "return false if the IPv6 is invalid" in {
    ip("1200::AB00:1234::2552:7777:1313") must beFalse
  }

  "return true if the IPv6 is valid" in {
    ip("1200:0000:AB00:1234:0000:2552:7777:1313") must beTrue
    ip("21DA:D3:0:2F3B:2AA:FF:FE28:9C5A") must beTrue
  }
}



([a-f0-9:]+:+)+[a-f0-9]+



ifconfig -a | egrep -o '([a-f0-9:]+:+)+[a-f0-9]+'



ifconfig -a | egrep -o '([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}) | (([a-f0-9:]+:+)+[a-f0-9]+)'



/(?!.*::.*::)(?!.*:::.*)(?!:[a-f0-9])((([a-f0-9]{1,4})?[:](?!:)){7}|(?=(.*:[:a-f0-9]{1,4}::|^([:a-f0-9]{1,4})?::))(([a-f0-9]{1,4})?[:]{1,2}){1,6})[a-f0-9]{1,4}/



[0-9a-f:]+



pattern = '^(?=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$)(?:(?:25[0-5]|[12][0-4][0-9]|1[5-9][0-9]|[1-9]?[0-9])\.?){4}$|(?=^(?:[0-9a-f]{0,4}:){2,7}[0-9a-f]{0,4}$)(?![^:]*::.+::[^:]*$)(?:(?=.*::.*)|(?=\w+:\w+:\w+:\w+:\w+:\w+:\w+:\w+))(?:(?:^|:)(?:[0-9a-f]{4}|[1-9a-f][0-9a-f]{0,3})){0,8}(?:::(?:[0-9a-f]{1,4}(?:$|:)){0,6})?$'
result = re.match(pattern, ip)
if result: result.group(0)



^\[([0-9a-fA-F]{1,4})(\:{1,2})([0-9a-fA-F]{1,4})(\:{1,2})([0-9a-fA-F]{1,4})(\:{1,2})([0-9a-fA-F]{1,4})(\:{1,2})([0-9a-fA-F]{1,4})\]



// IPv6 textual representation validating parser fully compliant with RFC-4291 and RFC-5952
// BSD-licensed / Copyright 2015-2017 Alexandre Fenyo

#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

typedef enum { false, true } bool;

static const char hexdigits[] = "0123456789abcdef";
static int digit2int(const char digit) {
  return strchr(hexdigits, digit) - hexdigits;
}

// This IPv6 address parser handles any valid textual representation according to RFC-4291 and RFC-5952.
// Other representations will return -1.
//
// note that str input parameter has been modified when the function call returns
//
// parse_ipv6(char *str, struct in6_addr *retaddr)
// parse textual representation of IPv6 addresses
// str:     input arg
// retaddr: output arg
int parse_ipv6(char *str, struct in6_addr *retaddr) {
  bool compressed_field_found = false;
  unsigned char *_retaddr = (unsigned char *) retaddr;
  char *_str = str;
  char *delim;

  bzero((void *) retaddr, sizeof(struct in6_addr));
  if (!strlen(str) || strchr(str, ':') == NULL || (str[0] == ':' && str[1] != ':') ||
      (strlen(str) >= 2 && str[strlen(str) - 1] == ':' && str[strlen(str) - 2] != ':')) return -1;

  // convert transitional to standard textual representation
  if (strchr(str, '.')) {
    int ipv4bytes[4];
    char *curp = strrchr(str, ':');
    if (curp == NULL) return -1;
    char *_curp = ++curp;
    int i;
    for (i = 0; i < 4; i++) {
      char *nextsep = strchr(_curp, '.');
      if (_curp[0] == '0' || (i < 3 && nextsep == NULL) || (i == 3 && nextsep != NULL)) return -1;
      if (nextsep != NULL) *nextsep = 0;
      int j;
      for (j = 0; j < strlen(_curp); j++) if (_curp[j] < '0' || _curp[j] > '9') return -1;
      if (strlen(_curp) > 3) return -1;
      const long val = strtol(_curp, NULL, 10);
      if (val < 0 || val > 255) return -1;
      ipv4bytes[i] = val;
      _curp = nextsep + 1;
    }
    sprintf(curp, "%x%02x:%x%02x", ipv4bytes[0], ipv4bytes[1], ipv4bytes[2], ipv4bytes[3]);
  }

  // parse standard textual representation
  do {
    if ((delim = strchr(_str, ':')) == _str || (delim == NULL && !strlen(_str))) {
      if (delim == str) _str++;
      else if (delim == NULL) return 0;
      else {
        if (compressed_field_found == true) return -1;
        if (delim == str + strlen(str) - 1 && _retaddr != (unsigned char *) (retaddr + 1)) return 0;
        compressed_field_found = true;
        _str++;
        int cnt = 0;
        char *__str;
        for (__str = _str; *__str; ) if (*(__str++) == ':') cnt++;
        unsigned char *__retaddr = - 2 * ++cnt + (unsigned char *) (retaddr + 1);
        if (__retaddr <= _retaddr) return -1;
        _retaddr = __retaddr;
      }
    } else {
      char hexnum[4] = "0000";
      if (delim == NULL) delim = str + strlen(str);
      if (delim - _str > 4) return -1;
      int i;
      for (i = 0; i < delim - _str; i++)
        if (!isxdigit(_str[i])) return -1;
        else hexnum[4 - (delim - _str) + i] = tolower(_str[i]);
      _str = delim + 1;
      *(_retaddr++) = (digit2int(hexnum[0]) << 4) + digit2int(hexnum[1]);
      *(_retaddr++) = (digit2int(hexnum[2]) << 4) + digit2int(hexnum[3]);
    }
  } while (_str < str + strlen(str));
  return 0;
}



        try {
            IPAddressString str = new IPAddressString("::1");
            IPAddress addr = str.toAddress();
            if(addr.isIPv6() || addr.isIPv6Convertible()) {
                IPv6Address ipv6Addr = addr.toIPv6();
            }
            //use address
        } catch(AddressStringException e) {
            //e.getMessage has validation error
        }



(([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4})