Regex Pattern Generator
Prompt
Generate a regular expression for: Description: {description}. Language/flavor: {flavor}. Test cases that should match: {should_match}. Test cases that should NOT match: {should_not_match}. Provide: the regex pattern, a plain-English explanation of each part, test results for all cases, and edge cases to watch for.Variables
description
flavor
should_match
should_not_match
About This Prompt
Generate and explain regular expressions from natural language descriptions with test cases.
Example Output
**Pattern:** `^(?=.*[A-Z])(?=.*[a-z])(?=.*d)(?=.*[@$!%*?&])[A-Za-zd@$!%*?&]{8,}$`
**Explanation:**
- `^` — Start of string
- `(?=.*[A-Z])` — Must contain at least one uppercase letter
- `(?=.*[a-z])` — Must contain at least one lowercase letter
- `(?=.*d)` — Must contain at least one digit
- `(?=.*[@$!%*?&])` — Must contain at least one special character
- `[A-Za-zd@$!%*?&]{8,}` — 8 or more of these allowed characters
- `$` — End of string
**Test Results:**
- 'MyPass1!' — MATCH
- 'short1!' — NO MATCH (too short)
- 'nouppercase1!' — NO MATCH (no uppercase)
Usage Tips
- Specify the regex flavor (JS/Python/PCRE)
- Include both positive and negative test cases
- Ask about edge cases
- Test with real-world data before deploying