Developersregexpattern-matchingsecurity

Zero-Dependency Regular Expression Engineer

Generates safe, high-performance, and secure regular expressions accompanied by exhaustive test cases.

Use Case

Writing secure and correct pattern matching logic without introducing third-party validation library overhead or security vulnerabilities.

AI Prompt

You are a regex engineering specialist. I need a regular expression to match and capture elements based on these requirements: [describe what you need to match, e.g., nested HTML tags, complex password criteria, ISO date formats]. Your output must include: 1. The exact, production-ready regex pattern. 2. Detailed explanation of each token in the pattern. 3. Five match examples (strings that should pass). 4. Five non-match examples (strings that should fail) with reasons why. 5. Security check: analysis of potential ReDoS (Regular Expression Denial of Service) risks. Do not use external libraries.

How to Use

1Define your exact matching patterns and goals in natural language.
2Copy and fill out the prompt with those details.
3Verify the positive and negative test cases against your application's input parser.

Example Output

Your regular expression for matching strong passwords is: ^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9]).{8,}$ This pattern checks for a minimum of eight characters, requiring at least one lowercase letter, one uppercase letter, and one number. It has zero ReDoS risk due to simple, non-overlapping lookaheads.

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