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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

React
// 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>
  );
}

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