Java Regex Broke My Brain | IP Address Validation + JS Functions #regex #runningcode

Java hit me with regex today.
Validate an IP address with ONE pattern.
The digit grouping I understand.
The 0-255 range validation — that's tomorrow's battle.

The problem:
→ Format: A.B.C.D
→ Each part: 0 to 255
→ Max 3 digits per part
→ Leading zeros allowed
→ Letters invalid
→ Extra dots invalid
→ Five parts invalid

What I understand so far:
→ Four groups separated by literal dots
→ Each group: \d{1,3} for 1 to 3 digits
→ Range 0-255 in regex requires pattern description not comparison

The range breakdown I'm studying:
100-199 → 1\d\d
200-249 → 2[0-4]\d
250-255 → 25[0-5]
All combined with | (OR)

JavaScript functions today:
→ Function declaration and calling
→ Multiple calls from one definition
→ Loop inside function
→ If-else inside function
→ Functions as reusable logic containers

Full regex solution tomorrow.

Drop a hint in comments — not the answer, just a direction 👇

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Видео Java Regex Broke My Brain | IP Address Validation + JS Functions #regex #runningcode канала Aditya Bhole