IPv4-IPv6-Regex

This regex matches IPv4 and IPv6 format (compatible with IPv6 short format like fe80::1)

DISCLAIMER: USE AT YOUR OWN RISK. DO NOT USE THIS REGEX FOR SECURITY APPLICATIONS UNTIL YOU HAVE TESTED IT MULTIPLE TIMES. ERRORS CAN OCCUR.

How to use ?

1. Copy and paste the content in the regex.txt file.
2. If you want to check an input, just use it like this (don't forget to sanitize and trim the text input before).
3. To search multiple IPs in a text file, remove the "^" at the beginning and the "$" at the end.

Features:

• Supports general IPv4 formats shortened shapes.
• Supports general IPv6 formats shortened shapes.

Testing:

1. Go to https://regex101.com/
2. Paste the regex.txt content in the regular expression field.
3. Paste the ip-samples.txt content in the text string.
4. Try with your own IPs.

Notes and improvements:

This regex was tested with more than 1,000 IPs with Python and was working. However, there are also thousands of IP formats.
This is why many of the IP regex patterns found online are BAD and easily breakable !
This one does not except the rule. So if an IP doesn’t match this regex, or a field that appears valid even though it’s not a valid IP, please correct the regex and share it!