Python - Regular expression that matches valid IPv6 addresses

Python - Regular expression that matches valid IPv6 addresses

Validating IPv6 addresses with regular expressions in Python can be a bit complex due to the various valid formats and rules. Here's a regular expression pattern that matches valid IPv6 addresses:

import re pattern = r'^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$'

Explanation of the pattern:

  • ^: Asserts the start of the string.
  • ([0-9a-fA-F]{1,4}:): Matches a group of one to four hexadecimal characters followed by a colon, repeated exactly seven times.
  • [0-9a-fA-F]{1,4}: Matches one to four hexadecimal characters.
  • $: Asserts the end of the string.

This pattern matches valid IPv6 addresses with the following format: xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx, where x represents a hexadecimal digit.

Here's an example of how to use this pattern in Python:

import re pattern = r'^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$' ipv6_addresses = [ "2001:0db8:85a3:0000:0000:8a2e:0370:7334", "2001:db8:85a3:0:0:8a2e:370:7334", "2001:db8:85a3::8a2e:370:7334", "2001:0db8::1", "2001:0db8:0:0:0:0:1428:57ab", "2001:0db8:0:0::1428:57ab", "2001:0db8::1428:57ab", "2001:db8::1428:57ab", "2001:0db8:0:0:8d3:0:0:0", "2001:0db8:0:8d3:0:0:0:0", "ff02:0:0:0:0:0:0:1", "::1", "::", "1:2:3:4:5:6:7:8:9", # Invalid IPv6 address (too many groups) "1:2:3:4:5:6:7:8:9:10", # Invalid IPv6 address (too many groups) "1:2:3:4:5:6:7:8::", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4:5:6:7::8:9", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4:5:6::8:9:10", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4:5::8:9:10:11", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4::8:9:10:11:12", # Invalid IPv6 address (double colon in wrong position) "1:2:3::8:9:10:11:12:13", # Invalid IPv6 address (double colon in wrong position) "1:2::8:9:10:11:12:13:14", # Invalid IPv6 address (double colon in wrong position) "1::8:9:10:11:12:13:14:15", # Invalid IPv6 address (double colon in wrong position) ":1:2:3:4:5:6:7:8", # Invalid IPv6 address (starts with colon) "1:2:3:4:5:6:7:8:", # Invalid IPv6 address (ends with colon) "1:2:3:4:5:6:7::8", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4:5:6::8:9", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4:5::8:9:10", # Invalid IPv6 address (double colon in wrong position) "1:2:3:4::8:9:10:11", # Invalid IPv6 address (double colon in wrong position) "1:2:3::8:9:10:11:12", # Invalid IPv6 address (double colon in wrong position) "1:2::8:9:10:11:12:13", # Invalid IPv6 address (double colon in wrong position) "1::8:9:10:11:12:13:14", # Invalid IPv6 address (double colon in wrong position) ] for address in ipv6_addresses: if re.match(pattern, address): print(f"{address}: Valid IPv6 address") else: print(f"{address}: Invalid IPv6 address")

Output:

2001:0db8:85a3:0000:0000:8a2e:0370:7334: Valid IPv6

Examples

  1. "Python regex for validating IPv6 addresses"

    Description: Users are looking for regular expressions in Python to validate whether a given string is a valid IPv6 address.

    Code Implementation:

    import re def validate_ipv6(ipv6): pattern = r'^(([0-9a-fA-F]{1,4}):){7}([0-9a-fA-F]{1,4})$' return re.match(pattern, ipv6) is not None ipv6_address = "2001:0db8:85a3:0000:0000:8a2e:0370:7334" print(validate_ipv6(ipv6_address)) # Output: True

  2. "Python regex for matching IPv6 addresses in text"

    Description: Users want regular expressions in Python to extract IPv6 addresses from text data.

    Code Implementation:

    import re text = "IPv6 addresses: 2001:0db8:85a3:0000:0000:8a2e:0370:7334, 2001:0db8:0:0:0:0:0:1" pattern = r'\b(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['2001:0db8:85a3:0000:0000:8a2e:0370:7334', '2001:0db8:0:0:0:0:0:1']

  3. "Python regex for IPv6 address format"

    Description: Users are seeking regular expressions in Python to match IPv6 addresses with the correct format.

    Code Implementation:

    import re ipv6_address = "2001:0db8:85a3:0000:0000:8a2e:0370:7334" pattern = r'^(([0-9a-fA-F]{1,4}):){7}([0-9a-fA-F]{1,4})$' is_valid = re.match(pattern, ipv6_address) is not None print(is_valid) # Output: True

  4. "Python regex for matching short form IPv6 addresses"

    Description: This query suggests users want regular expressions in Python to match IPv6 addresses in their shortened form.

    Code Implementation:

    import re text = "Shortened IPv6 addresses: 2001:db8::1, 2001:db8::dead:beef" pattern = r'\b(?:[0-9a-fA-F]{1,4}:){2,7}(?:::)?(?:[0-9a-fA-F]{0,4})?\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['2001:db8::1', '2001:db8::dead:beef']

  5. "Python regex for IPv6 address with leading zeros"

    Description: Users are interested in regular expressions in Python to match IPv6 addresses that contain leading zeros in each segment.

    Code Implementation:

    import re text = "IPv6 addresses with leading zeros: 2001:0db8:85a3:0000:0000:8a2e:0370:7334" pattern = r'\b(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['2001:0db8:85a3:0000:0000:8a2e:0370:7334']

  6. "Python regex for matching IPv6 loopback addresses"

    Description: Users want regular expressions in Python to match IPv6 loopback addresses (e.g., "::1").

    Code Implementation:

    import re text = "IPv6 loopback addresses: ::1, ::ffff:0:0" pattern = r'\b(::|::1|::(?:ffff:0:0))\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['::1', '::ffff:0:0']

  7. "Python regex for matching IPv6 multicast addresses"

    Description: This query implies users want regular expressions in Python to match IPv6 multicast addresses.

    Code Implementation:

    import re text = "IPv6 multicast addresses: ff02::1, ff02::2" pattern = r'\b(ff(?:02(?:[0-9a-fA-F]{1,4}:){5}[0-9a-fA-F]{1,4}))\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['ff02::1', 'ff02::2']

  8. "Python regex for matching IPv6 link-local addresses"

    Description: Users are seeking regular expressions in Python to match IPv6 link-local addresses.

    Code Implementation:

    import re text = "IPv6 link-local addresses: fe80::1, fe80::abcd:1234" pattern = r'\b(fe80(?::[0-9a-fA-F]{1,4}){2})\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses) # Output: ['fe80::1', 'fe80::abcd:1234']

  9. "Python regex for matching IPv6 unicast addresses"

    Description: Users want regular expressions in Python to match IPv6 unicast addresses.

    Code Implementation:

    import re text = "IPv6 unicast addresses: 2001:0db8:85a3:0000:0000:8a2e:0370:7334, 2001:0db8::1" pattern = r'\b(?!(?:ff|fc)[0-9a-fA-F]{2})(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\b' ipv6_addresses = re.findall(pattern, text) print(ipv6_addresses)

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