Validate an IPv4 address string

Q: Validate an IPv4 address string

Evaluates string parsing and input-validation skills, including digit-only checks, delimiter-based splitting, numeric range enforcement, and edge-case handling. Commonly asked to assess attention to input formats and robustness in implementation; Category: Coding & Algorithms; Level: implementation-level (concrete string manipulation and validation).

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Question

Given a string s, determine whether it is a valid IPv4 address.

A valid IPv4 address:

Has exactly 4 parts separated by dots ( . ): x1.x2.x3.x4
Each part is a base-10 integer in the range [0, 255]
No extra characters are allowed (only digits and dots)

Examples:

Valid: "192.168.1.1" , "192.168.1.0"
Invalid: "192.168.100.1.1" (5 parts), "192.1681.1" (missing dot separation)

Write a function that returns True if s is a valid IPv4 address and False otherwise.

Validate an IPv4 address string

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