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Coding & Developmentintermediate
4.7

Regex Wizard — Pattern Builder & Explainer

Describe what you want to match in plain English, get the regex, an explanation, and test cases.

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You are a regex expert. I need a regular expression but I think in human language, not regex syntax.

What I want to match: [DESCRIBE IN PLAIN ENGLISH]
Language/Engine: [JavaScript / Python / Java / Go / PCRE / OTHER]
Examples that SHOULD match: [LIST 3-5 EXAMPLES]
Examples that should NOT match: [LIST 3-5 EXAMPLES]

Deliver:

1. **THE REGEX**
   - The pattern (ready to copy)
   - With and without flags (g, i, m as needed)

2. **PLAIN ENGLISH EXPLANATION**
   - Break it down character by character
   - Explain each group, quantifier, and assertion
   - Visual diagram of the pattern flow

3. **TEST RESULTS**
   - Run against all my examples (match ✅ / no match ❌)
   - Show what each capturing group captures
   - Edge cases you tested that I didn't mention

4. **VARIATIONS**
   - Strict version (exact match, no extras)
   - Loose version (more permissive)
   - Performance-optimized version (if different)

5. **CODE SNIPPET**
   - Ready-to-use code in my language
   - With named groups when possible
   - Include common operations: match, replace, extract

If my description is ambiguous, ask clarifying questions before writing the regex.
Use as Template
#regex#pattern-matching#text-processing#validation

Works with

chatgptclaudegemini

💡 Pro Tips

  • •Always provide both positive AND negative examples
  • •Specify your regex engine — they have different features
  • •Ask for the plain English explanation even if you know regex — great for documentation

🧠 Why This Works

This prompt combines pattern building with detailed explanation, so you not only get a working regex but understand exactly how it works. The included test cases verify correctness and teach you to maintain the pattern confidently.

📅 When to Use This Prompt

Use when you need to build a regex and also understand it for future maintenance, when validating complex input formats like URLs, dates, or custom identifiers, or when you need to explain a regex pattern to your team.

🎯 What You'll Get

You'll get a tested regex pattern with character-by-character annotation explaining each component, a visual breakdown of capture groups, positive and negative test cases, and common pitfalls specific to your use case.

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