Regex Builder

What it does

The Regex Builder is a dual-mode utility designed to eliminate the frustration of working with regular expressions. It functions as both a generator and a translator: it can convert complex natural language requirements into optimized regex patterns, or take an existing arcane regex string and break it down into a human-readable explanation.

How it works

For developers building new features, the skill parses intent (data type, constraints, and context) to construct patterns tailored to specific language flavors including JavaScript, Python, Go, Rust, and PHP. In reverse, the "Explain Mode" performs a token-by-token analysis of any provided regex to reveal exactly what it matches and where it might fail.

Why use this skill

Unlike general-purpose AI prompting, this skill follows a structured architectural process: it accounts for engine-specific limitations (like RE2's lack of lookarounds), provides validated test cases (3 matches, 2 non-matches), and generates ready-to-run code snippets. It ensures your patterns are not just syntactically correct, but also optimized for your specific programming environment.

Output format

• Flavor-Specific Patterns: Correct syntax for your chosen language engine.
• Logical Breakdowns: Token-by-token explanations of what every metacharacter does.
• Unit Tests: Concrete examples of strings that will and will not match.
• Implementation Code: Boilerplate snippets for immediate integration.