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    copied!<p>Ok what do you need to see exactly? Here is my full code:</p> <pre><code> [DllImport("user32.dll")] // import lockwindow to remove flashing public static extern bool LockWindowUpdate(IntPtr hWndLock); public void Markup(RichTextBox RTB) { try { int selectionstart = richTextBox1.SelectionStart; Point pos = richTextBox1.Location; richTextBox1.Focus(); int topIndex = richTextBox1.GetCharIndexFromPosition(new Point(1, 1)); //int topIndex = richTextBox1.GetCharIndexFromPosition(point); int bottomIndex = richTextBox1.GetCharIndexFromPosition(new Point(1, richTextBox1.Height - 1)); int topLine = richTextBox1.GetLineFromCharIndex(topIndex); int bottomLine = richTextBox1.GetLineFromCharIndex(bottomIndex); int start = richTextBox1.GetFirstCharIndexFromLine(topLine); int end = richTextBox1.GetFirstCharIndexFromLine(bottomLine); int numLinesDisplayed = (bottomLine - topLine) + 2; richTextBox1.Focus(); richTextBox1.Select(start, end); Regex rex = new Regex("&lt;html&gt;|&lt;/html&gt;|&lt;head.*?&gt;|&lt;/head&gt;|&lt;body.*?&gt;|&lt;/body&gt;|&lt;div.*?&gt;|&lt;/div&gt;|&lt;span.*?&gt;|&lt;/span&gt;|&lt;title.*?&gt;|&lt;/title&gt;|&lt;style.*?&gt;|&lt;/style&gt;|&lt;script.*?&gt;|&lt;/script&gt;|&lt;link.*?/&gt;|&lt;meta.*?/&gt;|&lt;base.*?/&gt;|&lt;center.*?&gt;|&lt;/center&gt;"); foreach (Match m in rex.Matches(richTextBox1.SelectedText)) { richTextBox1.Select(m.Index + start, m.Value.Length); richTextBox1.SelectionColor = Color.Blue; richTextBox1.Select(selectionstart, -1); richTextBox1.SelectionColor = Color.Black; } richTextBox1.DeselectAll(); richTextBox1.SelectionStart = selectionstart; } catch (Exception ex) { MessageBox.Show("Error: " + ex); } } private void richTextBox1_VScroll(object sender, EventArgs e) { try { LockWindowUpdate(richTextBox1.Handle);//Stop flashing Markup(richTextBox1); Elements(richTextBox1); FormsTabels(richTextBox1); Attributes(richTextBox1); Comments(richTextBox1); } finally { LockWindowUpdate(IntPtr.Zero); } } </code></pre>
 

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