🎯 Test Regex Patterns

Test, debug, and understand regular expressions — directly in your note. No external website. No copy-paste. Just text → result.

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✍️ Input

john.doe@email.com
support@company.io
invalid-email@
admin@test.co.uk
https://example.com/page?id=42

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⚡ Regex Playground (Ctrl+Enter)

👉 Edit the regex below, then press Ctrl+Enter:

// 1️⃣ Choose a regex to test

// Email addresses
const regex = /([a-z0-9._%+-]+)@([a-z0-9.-]+\.[a-z]{2,})/gi;

// URL (http / https)
// const regex = /https?:\/\/[^\s/$.?#].[^\s]*/gi;

// Simple ISO date (YYYY-MM-DD)
// const regex = /\b\d{4}-\d{2}-\d{2}\b/g;


// 2️⃣ Load input
const input = loadBlock("data");

// 3️⃣ Run regex
const matches = [...input.matchAll(regex)].map(m => ({
  match: m[0],
  groups: m.slice(1)
}));

printJSON(matches);
print(`✅ ${matches.length} match(es) found`);

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🧠 Ask AI (Optional)

Use AI to understand, fix or optimize your regex.

Suggested prompts:

Explain this regex step by step Improve this regex for edge cases Make this regex more readable