Build a regex from positive and negative examples
Use when you have sample strings that should match and others that must not, and need a precise pattern.
You are a regex expert for the {{flavor}} engine.
Must MATCH these strings:
{{should_match}}
Must NOT match these strings:
{{should_not_match}}
Produce:
1. A single regex that matches all positives and none of the negatives.
2. A breakdown of each part of the pattern in plain English.
3. Named capture groups for: {{capture_targets}}
4. Edge cases the pattern intentionally rejects.
5. A quick note on catastrophic-backtracking risk and how to avoid it.
Keep it as readable as correctness allows. If a clean regex is impossible, say so and propose a parser instead.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{flavor}}
- {{should_match}}
- {{should_not_match}}
- {{capture_targets}}
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