Issue with IP Validation regex

[SumithThota]

Problem :

I found that the IP regex pattern /\b((\d{1,3}\.){3}\d{1,3})\b|\b([a-fA-F0-9:]+:+[a-fA-F0-9:]+)\b/g at Source
will fails to handle several edge cases and may incorrectly validate certain IP formats.

Propsal :

Proposed pattern: /\s*(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))\s*|\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]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){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]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){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]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){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]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){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]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*/g

These are the key differences between previous regex and proposed regex

Key Differences Between Current Regex and Proposed Regex

#	Feature	Current Regex	Proposed Regex
1	IPv4 Range Validation	\d{1,3} → Accepts 0-999	`25[0-5]
2a	Invalid IPv4: 999.999.999.999	✅ Matches (Wrong Match)	❌ Rejects (Correct - All octets way beyond 255 is invalid)
2b	Invalid IPv4: 256.256.256.256	✅ Matches (Wrong Match)	❌ Rejects (Correct - Max is 255)
2c	Invalid IPv4: 1.2.3	✅ Matches (Wrong Match)	❌ Rejects (Correct - IPv4 requires exactly 4 octets)
3	Boundary Detection	\b word boundaries	\s* whitespace
4	Pattern Length	~50 characters	~2000 characters
5	IPv6 Validation	[a-fA-F0-9:]+:+[a-fA-F0-9:]+ → Very loose	Comprehensive patterns → Strict
6	False Positives: abc:def	✅ Matches (BAD)	❌ Rejects (GOOD)

Goal

Enhance the IP validation to ensure correctly validate certain addresses

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