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    <p>Well I had to do some assumptions on your variable names and I hope I did it right. Basically your code worked for me but I didn't understand the first line:</p> <pre><code>int index = text.indexOf(myWord); </code></pre> <p>I think it should be:</p> <pre><code>int index = text.indexOf(pattern); </code></pre> <p>Anyway, I wrote this code and it worked for me:</p> <pre><code>String pattern = "&lt;aa&gt;"; String text = textArea.getText(); int index = text.indexOf(pattern); while(index &gt;= 0){ try { hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter); index = text.indexOf(pattern, index + pattern.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } } </code></pre> <hr> <p><strong>Update</strong></p> <blockquote> <p>Look when you click on the end of marked text and start typing the text will be also marked- it is a my bug.</p> </blockquote> <p>Sorry I didn't see that before. I don't think you can <em>stop</em> a highlighter but you can make it using a <code>CaretListener</code> and doing the stuff there. This way if you input a new string that matches your pattern it will be highlighted too:</p> <pre><code>textArea.addCaretListener(new CaretListener() { @Override public void caretUpdate(CaretEvent e) { if(e.getMark() == e.getDot()){ Highlighter hl = textArea.getHighlighter(); hl.removeAllHighlights(); String pattern = "&lt;aa&gt;"; String text = textArea.getText(); int index = text.indexOf(pattern); while(index &gt;= 0){ try { Object o = hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter); index = text.indexOf(pattern, index + pattern.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } } } } }); </code></pre> <p>Note <code>e.getMark() == e.getDot()</code> means "there's no text selection" based on <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/event/CaretEvent.html#getDot%28%29" rel="noreferrer">CaretEvent.getDot()</a> and <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/event/CaretEvent.html#getMark%28%29" rel="noreferrer">CaretEvent.getMark()</a> javadoc. Otherwise you shouldn't highlight anything but selected text.</p> <p><strong>Screenshot</strong></p> <p><img src="https://i.stack.imgur.com/t8GIR.jpg" alt="enter image description here"></p> <p><strong>Updated SSCCE</strong></p> <p>Here's a complete <a href="http://sscce.org/" rel="noreferrer">SSCCE</a> to test it:</p> <pre><code>import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingUtilities; import javax.swing.event.CaretEvent; import javax.swing.event.CaretListener; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; import javax.swing.text.Highlighter; public class Demo { private void initGUI(){ final JTextArea textArea = new JTextArea(); textArea.addCaretListener(new CaretListener() { @Override public void caretUpdate(CaretEvent e) { if(e.getMark() == e.getDot()){ Highlighter hl = textArea.getHighlighter(); hl.removeAllHighlights(); String pattern = "&lt;aa&gt;"; String text = textArea.getText(); int index = text.indexOf(pattern); while(index &gt;= 0){ try { Object o = hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter); index = text.indexOf(pattern, index + pattern.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } } } } }); JScrollPane scrollPane = new JScrollPane(textArea); scrollPane.setPreferredSize(new Dimension(300,200)); JPanel content = new JPanel(new FlowLayout()); content.add(scrollPane); JFrame frame = new JFrame("Demo"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.setContentPane(content); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new Demo().initGUI(); } }); } } </code></pre>
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    1. COBasically that's the same code as that in the question... isn't it? But good effort on the SSCCE side. +1
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    2. COYou're right. My second sentence writes *Basically your code worked for me but I didn't understand the first line*
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    3. COThanks for the answer, look when you click on the end of marked text and start typing the text will be also marked- it is a my bug.
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      1. USTomasz Waszczyk
 

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