Building CLIAR — A simple drop-in Java class for parsing command-line arguments (Part 3)

Short summary

Part 3 of the CLIAR Java CLI argument parser series focuses on option validation and mapping parsed arguments to declared options. It establishes naming rules for short options (single alphabetic character) and long options (start with letter, then alphanumeric/hyphens), defines an Option class to register allowed options with validation rules, and demonstrates parsing logic for grouped short options (-abc) and key-value pairs (--output=file.txt). The parser checks each parsed argument against declared options, rejecting duplicates and invalid names.

• •Defines naming rules: short options must be single alphabetic chars, long options must start with a letter and contain only alphanumeric chars or hyphens
• •Introduces an Option class to register declared options with validation constraints (required/optional, expects value, short/long form)
• •Shows parsing logic that validates parsed arguments against declared options, handling grouped short options and key=value syntax

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