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Python IPV4 / IPV6 Regular Expressions (REGEX)
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| # Constructed with help from | |
| # http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses | |
| # Try it on regex101: https://regex101.com/r/yVdrJQ/1 | |
| import re | |
| IPV4SEG = r'(?:25[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])' | |
| IPV4ADDR = r'(?:(?:' + IPV4SEG + r'\.){3,3}' + IPV4SEG + r')' | |
| IPV6SEG = r'(?:(?:[0-9a-fA-F]){1,4})' | |
| IPV6GROUPS = ( | |
| r'(?:' + IPV6SEG + r':){7,7}' + IPV6SEG, # 1:2:3:4:5:6:7:8 | |
| r'(?:' + IPV6SEG + r':){1,7}:', # 1:: 1:2:3:4:5:6:7:: | |
| r'(?:' + IPV6SEG + r':){1,6}:' + IPV6SEG, # 1::8 1:2:3:4:5:6::8 1:2:3:4:5:6::8 | |
| r'(?:' + IPV6SEG + r':){1,5}(?::' + IPV6SEG + r'){1,2}', # 1::7:8 1:2:3:4:5::7:8 1:2:3:4:5::8 | |
| r'(?:' + IPV6SEG + r':){1,4}(?::' + IPV6SEG + r'){1,3}', # 1::6:7:8 1:2:3:4::6:7:8 1:2:3:4::8 | |
| r'(?:' + IPV6SEG + r':){1,3}(?::' + IPV6SEG + r'){1,4}', # 1::5:6:7:8 1:2:3::5:6:7:8 1:2:3::8 | |
| r'(?:' + IPV6SEG + r':){1,2}(?::' + IPV6SEG + r'){1,5}', # 1::4:5:6:7:8 1:2::4:5:6:7:8 1:2::8 | |
| IPV6SEG + r':(?:(?::' + IPV6SEG + r'){1,6})', # 1::3:4:5:6:7:8 1::3:4:5:6:7:8 1::8 | |
| r':(?:(?::' + IPV6SEG + r'){1,7}|:)', # ::2:3:4:5:6:7:8 ::2:3:4:5:6:7:8 ::8 :: | |
| r'fe80:(?::' + IPV6SEG + r'){0,4}%[0-9a-zA-Z]{1,}', # fe80::7:8%eth0 fe80::7:8%1 (link-local IPv6 addresses with zone index) | |
| r'::(?:ffff(?::0{1,4}){0,1}:){0,1}[^\s:]' + IPV4ADDR, # ::255.255.255.255 ::ffff:255.255.255.255 ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses) | |
| r'(?:' + IPV6SEG + r':){1,4}:[^\s:]' + IPV4ADDR, # 2001:db8:3:4::192.0.2.33 64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address) | |
| ) | |
| IPV6ADDR = '|'.join(['(?:{})'.format(g) for g in IPV6GROUPS[::-1]]) # Reverse rows for greedy match | |
| tests = [ | |
| '1::', | |
| '1:2:3:4:5:6:7::', | |
| '1::8', | |
| '1:2:3:4:5:6::8', | |
| '1:2:3:4:5:6::8', | |
| '1::7:8', | |
| '1:2:3:4:5::7:8', | |
| '1:2:3:4:5::8', | |
| '1::6:7:8', | |
| '1:2:3:4::6:7:8', | |
| '1:2:3:4::8', | |
| '1::5:6:7:8', | |
| '1:2:3::5:6:7:8', | |
| '1:2:3::8', | |
| '1::4:5:6:7:8', | |
| '1:2::4:5:6:7:8', | |
| '1:2::8', | |
| '1::3:4:5:6:7:8', | |
| '1::3:4:5:6:7:8', | |
| '1::8', | |
| '::2:3:4:5:6:7:8', | |
| '::2:3:4:5:6:7:8', | |
| '::8', | |
| '::', | |
| 'fe80::7:8%eth0', | |
| 'fe80::7:8%1', | |
| '::255.255.255.255', | |
| '::ffff:255.255.255.255', | |
| '::ffff:0:255.255.255.255', | |
| '2001:db8:3:4::192.0.2.33', | |
| '64:ff9b::192.0.2.33', | |
| ] | |
| # IPV6ADDR Tests | |
| def test_individual(tests): | |
| for t in tests: | |
| assert re.search(IPV6ADDR, t).group() == t | |
| # MULTILINE | |
| def test_multiline(tests): | |
| _tests = tests[:] | |
| for t in re.findall(IPV6ADDR, ' '.join(tests)): | |
| _tests.remove(t) | |
| assert not _tests | |
| test_individual(tests) | |
| test_multiline(tests) |
Line 22: replace r'(?:' + IPV6SEG + r':){1,4}:[^\s:]' + IPV4ADDR with r'(?:' + IPV6SEG + r':){1,6}:?[^\s:]' + IPV4ADDR, and that will cover fooofei's corner case.
Add case insensitive flag to line 22 to match ::FFFF:129.144.52.38 !
IPV6GROUPS = (
r'(?:' + IPV6SEG + r':){7,7}' + IPV6SEG, # 1:2:3:4:5:6:7:8
r'(?:' + IPV6SEG + r':){1,7}:', # 1:: 1:2:3:4:5:6:7::
r'(?:' + IPV6SEG + r':){1,6}:' + IPV6SEG, # 1::8 1:2:3:4:5:6::8 1:2:3:4:5:6::8
r'(?:' + IPV6SEG + r':){1,5}(?::' + IPV6SEG + r'){1,2}', # 1::7:8 1:2:3:4:5::7:8 1:2:3:4:5::8
r'(?:' + IPV6SEG + r':){1,4}(?::' + IPV6SEG + r'){1,3}', # 1::6:7:8 1:2:3:4::6:7:8 1:2:3:4::8
r'(?:' + IPV6SEG + r':){1,3}(?::' + IPV6SEG + r'){1,4}', # 1::5:6:7:8 1:2:3::5:6:7:8 1:2:3::8
r'(?:' + IPV6SEG + r':){1,2}(?::' + IPV6SEG + r'){1,5}', # 1::4:5:6:7:8 1:2::4:5:6:7:8 1:2::8
IPV6SEG + r':(?:(?::' + IPV6SEG + r'){1,6})', # 1::3:4:5:6:7:8 1::3:4:5:6:7:8 1::8
r':(?:(?::' + IPV6SEG + r'){1,7}|:)', # ::2:3:4:5:6:7:8 ::2:3:4:5:6:7:8 ::8 ::
r'fe80:(?::' + IPV6SEG + r'){0,4}%[0-9a-zA-Z]{1,}', # fe80::7:8%eth0 fe80::7:8%1 (link-local IPv6 addresses with zone index)
r'::(?i:ffff(?::0{1,4}){0,1}:){0,1}[^\s:]' + IPV4ADDR, # ::255.255.255.255 ::ffff:255.255.255.255 ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses)
r'(?:' + IPV6SEG + r':){1,4}:[^\s:]' + IPV4ADDR, # 2001:db8:3:4::192.0.2.33 64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address)
)
Add case insensitive flag to line 22 to match
::FFFF:129.144.52.38!IPV6GROUPS = ( r'(?:' + IPV6SEG + r':){7,7}' + IPV6SEG, # 1:2:3:4:5:6:7:8 r'(?:' + IPV6SEG + r':){1,7}:', # 1:: 1:2:3:4:5:6:7:: r'(?:' + IPV6SEG + r':){1,6}:' + IPV6SEG, # 1::8 1:2:3:4:5:6::8 1:2:3:4:5:6::8 r'(?:' + IPV6SEG + r':){1,5}(?::' + IPV6SEG + r'){1,2}', # 1::7:8 1:2:3:4:5::7:8 1:2:3:4:5::8 r'(?:' + IPV6SEG + r':){1,4}(?::' + IPV6SEG + r'){1,3}', # 1::6:7:8 1:2:3:4::6:7:8 1:2:3:4::8 r'(?:' + IPV6SEG + r':){1,3}(?::' + IPV6SEG + r'){1,4}', # 1::5:6:7:8 1:2:3::5:6:7:8 1:2:3::8 r'(?:' + IPV6SEG + r':){1,2}(?::' + IPV6SEG + r'){1,5}', # 1::4:5:6:7:8 1:2::4:5:6:7:8 1:2::8 IPV6SEG + r':(?:(?::' + IPV6SEG + r'){1,6})', # 1::3:4:5:6:7:8 1::3:4:5:6:7:8 1::8 r':(?:(?::' + IPV6SEG + r'){1,7}|:)', # ::2:3:4:5:6:7:8 ::2:3:4:5:6:7:8 ::8 :: r'fe80:(?::' + IPV6SEG + r'){0,4}%[0-9a-zA-Z]{1,}', # fe80::7:8%eth0 fe80::7:8%1 (link-local IPv6 addresses with zone index) r'::(?i:ffff(?::0{1,4}){0,1}:){0,1}[^\s:]' + IPV4ADDR, # ::255.255.255.255 ::ffff:255.255.255.255 ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses) r'(?:' + IPV6SEG + r':){1,4}:[^\s:]' + IPV4ADDR, # 2001:db8:3:4::192.0.2.33 64:ff9b::192.0.2.33 (IPv4-Embedded IPv6 Address) )
@x41lakazam Is the change you mentioned actually applied to the line 21 in original source?
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This regex cannot match a valid IPv6 address
0:0:0:0:0:0:10.0.0.1