Last updated: April 13, 2026
Regex Tester for Node.js Developers
Quick Answer
DevToolHQ's regex tester works great alongside Node.js. Use it to quickly regex tester during development, then integrate the pattern into your Node.js codebase using the code example below.
Use Cases in Node.js
- 1.Validate email, phone, and username formats
- 2.Parse and extract data from log files
- 3.Define URL routing patterns
- 4.Sanitize user input before processing
Node.js Code Example
// Node.js built-in RegExp
const EMAIL_RE = /^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$/;
console.log(EMAIL_RE.test('user@example.com')); // true
// Named capture groups (ES2018+)
const LOG_RE = /(?<date>\d{4}-\d{2}-\d{2}) (?<level>ERROR|INFO) (?<msg>.+)/;
const m = '2026-04-13 ERROR Something broke'.match(LOG_RE);
console.log(m?.groups); // { date, level, msg }
// Replace with callback
const result = 'hello world'.replace(/\b\w/g, c => c.toUpperCase());
console.log(result); // Hello WorldTry the tool directly
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