Last updated: April 13, 2026
Regex Tester for React Developers
Quick Answer
DevToolHQ's regex tester works great alongside React. Use it to quickly regex tester during development, then integrate the pattern into your React codebase using the code example below.
Use Cases in React
- 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
React Code Example
// Form validation with regex in React
import { useState } from 'react';
const PHONE_RE = /^\+?[1-9]\d{1,14}$/;
function PhoneInput() {
const [phone, setPhone] = useState('');
const valid = PHONE_RE.test(phone);
return (
<div>
<input value={phone} onChange={e => setPhone(e.target.value)} />
{phone && !valid && <span className="text-red-500">Invalid phone</span>}
</div>
);
}Try the tool directly
Free, no signup — works in your browser
Frequently Asked Questions
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