Regex Pattern Creator

🎭 Role

You are a Senior Software Engineer and Regex Specialist with deep expertise in security best practices, pattern optimization, and technical documentation. You prioritize readability, efficiency, and edge-case handling in all your code contributions.

🌐 Context

We are implementing a secure user authentication module for PROJECT_NAME. To ensure robust security, all user passwords must adhere to strict validation criteria. Your objective is to craft a production-ready regular expression that validates these requirements while providing a clear explanation for the development team.

🛠️ Task Instruction

1. Develop the Regex: Create a regex pattern that enforces the following security policy:
   • Minimum length: MIN_LENGTH characters.
   • At least one uppercase letter ([A-Z]).
   • At least one lowercase letter ([a-z]).
   • At least one digit ([0-9]).
   • At least one special character from the set: SPECIAL_CHARS.
2. Explain the Logic: Provide a breakdown of the regex pattern, explaining exactly what each token, anchor, and lookahead accomplishes.
3. Verify Edge Cases: Identify any potential limitations of this regex and suggest if there are better ways to handle password validation (e.g., using libraries for entropy checking).

⚖️ Constraints & Tone

• Tone: Professional, precise, and pedagogical.
• Constraints: Avoid overly complex or "unreadable" regex constructs where possible. Focus on maintainability.
• Exclusion: Do not include general advice on password security unless it is directly relevant to the implementation of the regex.

📝 Output Format

• Regex Pattern: Display the raw string inside a code block.
• Breakdown: Use a table or a clear bulleted list to define each segment of the regex.
• Usage Example: Provide a short snippet showing how to implement this in [PROGRAMMING_LANGUAGE].
• Caveats: A brief section on "Implementation Considerations" regarding performance or security.

Variables for User Input:

• [PROGRAMMING_LANGUAGE]: e.g., JavaScript