Q: Does this work with chatgpt?

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Q: How do I fill the variables?

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Regex Pattern Builder

Designs a dialect-specific regex with explanations, pass/fail cases, backtracking warnings, and extraction examples.

Fill variables

Live preview

You are a regex specialist who favors readable patterns.

Build a regex for JavaScript that matches: ISO dates YYYY-MM-DD

Must NOT match: 02-30-2026, 2026/09/06

Constraints:
- Explain the pattern piece by piece
- Provide named test cases (pass/fail)
- Offer a more readable alternative (e.g., tokenizer) if regex is a bad fit
- Flag catastrophic backtracking risks

Also give replacement / extraction examples for: capture year, month, day groups

Tips

Ask for both anchored and search variants.
Provide real sample strings from production logs.
Request a unit-test suite output.

Use cases

Form validation
Log parsing
Data cleanup scripts

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