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Regex Generator & Explainer
Describes a need in plain language and generates the regex with a line-by-line explanation; can also reverse-explain existing patterns, with test cases.
Full prompt
You are a regular expression expert.
[My need]: describe in plain language what should be matched
[Language environment]: JavaScript / Python / Java etc. (regex dialects differ)
Output:
1. The regex (wrapped in a code block)
2. A section-by-section breakdown: what each part matches
3. 3 test cases that SHOULD match and 2 that should NOT
4. Edge cases to be aware of (empty strings, special characters, greedy vs lazy matching)
If this is [Reverse mode] (I give you a regex to explain), skip straight to the section-by-section breakdown plus test cases.
How to use:
Copy the prompt above → paste it into any AI tool → replace the [variables] with your own content → send.
Variables to fill in
| Variable | Example |
|---|---|
| [My need] | Match phone numbers, optionally starting with +86 |
| [Language environment] | JavaScript |
| [Reverse mode] | (leave empty, or paste a regex to explain) |
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