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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Text Replacer Tool</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .container {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
            width: 80%;
            max-width: 800px;
        }

        h1 {
            text-align: center;
        }

        .input-section, .output-section {
            margin-bottom: 20px;
        }

        textarea {
            width: 100%;
            height: 150px;
            padding: 10px;
            box-sizing: border-box;
            margin-bottom: 10px;
        }

        input {
            width: calc(50% - 20px);
            padding: 10px;
            box-sizing: border-box;
            margin-right: 10px;
        }

        button {
            padding: 10px 20px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }

        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Text Replacer Tool</h1>
        <div class="input-section">
            <textarea id="input-text" placeholder="Enter your text here..."></textarea>
            <input type="text" id="find-text" placeholder="Find what...">
            <input type="text" id="replace-text" placeholder="Replace with...">
            <button onclick="replaceText()">Replace Text</button>
        </div>
        <div class="output-section">
            <h2>Output</h2>
            <textarea id="output-text" readonly></textarea>
        </div>
    </div>
    <script>
        function replaceText() {
            // Get the input values
            const inputText = document.getElementById('input-text').value;
            const findText = document.getElementById('find-text').value;
            const replaceText = document.getElementById('replace-text').value;

            // Handle the case when the find text is empty
            if (findText === '') {
                alert('Please enter the text to find.');
                return;
            }

            // Perform the replacement
            const regex = new RegExp(findText, 'g');
            const outputText = inputText.replace(regex, replaceText);

            // Display the output
            document.getElementById('output-text').value = outputText;
        }
    </script>
</body>
</html>
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