Prompt Library
Coding
Regex Generator + Explainer
Get the regex, the explanation, and the failure cases.
The Prompt
Write a regex that matches: [describe pattern] Sample strings it MUST match: [examples] Sample strings it must REJECT: [examples] Return: the regex, a token-by-token explanation, and 3 tricky inputs where a naive version would fail.
Fill in before using
[pattern][examples]How to use it
- → Paste the prompt into your model of choice — it works with any frontier model.
- → Replace every bracketed placeholder with your specifics. Concrete inputs beat vague ones every time.
- → If the model asks a clarifying question, answer it — these prompts are designed to invite that.
- → Iterate on the output, not the prompt. The structure is already tuned.
regexvalidation