React Js Input url Validation

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState } = React;

function App() {
            const [urlValue, setUrlValue] = useState('');
            const [isValidUrl, setIsValidUrl] = useState(true);
            const [errorMessage, setErrorMessage] = useState('');

const handleChange = (event) => {
                setUrlValue(event.target.value);
                setIsValidUrl(true);
                setErrorMessage('');
            }

const handleSubmit = (event) => {
                event.preventDefault();

// URL validation using regular expressions
                const urlPattern = /^(http[s]?:\/\/)(www\.)?[^\s$.?#].[^\s]*$/;
                if (urlPattern.test(urlValue)) {
                    setIsValidUrl(true);
                    alert(urlValue); // Perform any necessary actions with the valid URL
                } else {
                    setIsValidUrl(false);
                    setErrorMessage('Please enter a valid URL.');
                }
            }

return (
                <div className='container'>
                    <form onSubmit={handleSubmit}>
                        <label>
                            URL:
                            <input
                                type="text"
                                value={urlValue}
                                onChange={handleChange}
                                className={!isValidUrl ? 'invalid' : ''}
                            />
                        </label>
                        {!isValidUrl && <p className="error-message">{errorMessage}</p>}
                        <button type="submit">Submit</button>
                    </form>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

form {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-top: 20px;
        }

label {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            margin-bottom: 10px;
        }

input[type="text"] {
            padding: 8px;
            border: 1px solid #ccc;
            border-radius: 4px;
            width: 300px;
        }

.invalid {
            border-color: red;
        }

.error-message {
            color: red;
            margin-top: 5px;
        }

button[type="submit"] {
            padding: 8px 16px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

button[type="submit"]:hover {
            background-color: #45a049;
        }
    </style>
</body>

</html>
``

 
<!DOCTYPE html>
<html>
​
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
​
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState } = React;
​
        function App() {
            const [urlValue, setUrlValue] = useState('');
            const [isValidUrl, setIsValidUrl] = useState(true);
            const [errorMessage, setErrorMessage] = useState('');
​
            const handleChange = (event) => {
                setUrlValue(event.target.value);
                setIsValidUrl(true);
                setErrorMessage('');
            }
​
            const handleSubmit = (event) => {
                event.preventDefault();
​
                // URL validation using regular expressions
                const urlPattern = /^(http[s]?:\/\/)(www\.)?[^\s$.?#].[^\s]*$/;
                if (urlPattern.test(urlValue)) {
                    setIsValidUrl(true);
                    alert(urlValue); // Perform any necessary actions with the valid URL
                } else {
                    setIsValidUrl(false);
                    setErrorMessage('Please enter a valid URL.');
                }
            }
​
            return (
                <div className='container'>
                    <form onSubmit={handleSubmit}>
                        <label>
                            URL:
                            <input
                                type="text"
                                value={urlValue}
                                onChange={handleChange}
                                className={!isValidUrl ? 'invalid' : ''}
                            />
                        </label>
                        {!isValidUrl && <p className="error-message">{errorMessage}</p>}
                        <button type="submit">Submit</button>
                    </form>
                </div>
            );
        }
​
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }
​
        .container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }
​
        form {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-top: 20px;
        }
​
        label {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            margin-bottom: 10px;
        }
​
        input[type="text"] {
            padding: 8px;
            border: 1px solid #ccc;
            border-radius: 4px;
            width: 300px;
        }
​
        .invalid {
            border-color: red;
        }
​
        .error-message {
            color: red;
            margin-top: 5px;
        }
​
        button[type="submit"] {
            padding: 8px 16px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
​
        button[type="submit"]:hover {
            background-color: #45a049;
        }
    </style>
</body>
​
</html>
``