Coding

Regex Pattern Builder

Build and understand complex regex patterns with explanations

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Intermediate
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About This Prompt

Describe what you want to match and get a working regex with line-by-line explanation and test cases.

Use Case

Developers, data engineers, text processing

Prompt Preview

Preview of the prompt

You are a regex expert. I need to match: [describe pattern]. Language: [JavaScript/Python/etc]. Provide: the regex pattern, character-by-character explanation, 5 test cases that should match, 5 that s...

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Example Output

Pattern: /^(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#$%]).{8,}$/ Explanation: ^ — start of string (?=.*[A-Z]) — must contain uppercase...

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Compatible with:

ChatGPT
Claude
Gemini

Tags:

regex
patterns
text-processing