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FX-Text-Area for formatted text and other special effects.
There is a newer version: 1.11

package org.fxmisc.richtext.demo;

import java.util.Collection;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.fxmisc.flowless.VirtualizedScrollPane;
import org.fxmisc.richtext.CodeArea;
import org.fxmisc.richtext.LineNumberFactory;
import org.fxmisc.richtext.model.StyleSpans;
import org.fxmisc.richtext.model.StyleSpansBuilder;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 * Name: XMLEditor
 * Description: .
 * 
 * Comment: ...
 * 
 * Copyright: Copyright (c) 2016-2019
 * Company: >StA-Soft<
 * @author StA
 * @version 1.0
 */

public class XMLEditor extends Application
{

  private static final Pattern XML_TAG = Pattern.compile("(?(]*)(\\h*/?>))" + "|(?)");

  private static final Pattern ATTRIBUTES = Pattern.compile("(\\w+\\h*)(=)(\\h*\"[^\"]+\")");

  private static final int GROUP_OPEN_BRACKET = 2;

  private static final int GROUP_ELEMENT_NAME = 3;

  private static final int GROUP_ATTRIBUTES_SECTION = 4;

  private static final int GROUP_CLOSE_BRACKET = 5;

  private static final int GROUP_ATTRIBUTE_NAME = 1;

  private static final int GROUP_EQUAL_SYMBOL = 2;

  private static final int GROUP_ATTRIBUTE_VALUE = 3;

  /**
   * Beispiel-Text.
   */

  private static final String SAMPLE_CODE = String.join("\n", new String[]{
    "",
    "",
    "< orders >",
    "  ",
    "    ",
    "      ",
    "        ESPRESSO",
    "        2",
    "        false",
    "        1",
    "      ",
    "      ",
    "        CAPPUCCINO",
    "        1",
    "        false",
    "        1",
    "      ",
    "      ",
    "      LATTE",
    "        2",
    "        false",
    "        1",
    "      ",
    "      ",
    "        MOCHA",
    "        3",
    "        true",
    "        1",
    "      ",
    "    ",
    "  ",
    ""
  });


  /**
   * Main-Methode.
   * @param args Kommandozeilenparameter
   */

  public static void main(String[] args)
  {
    launch(args);
  }

  @Override
  public void start(Stage primaryStage)
  {
    CodeArea codeArea = new CodeArea();
    codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea));

    codeArea.textProperty().addListener((obs, oldText, newText) ->
    {
      codeArea.setStyleSpans(0, computeHighlighting(newText));
    });
    codeArea.replaceText(0, 0, SAMPLE_CODE);

    Scene scene = new Scene(new StackPane(new VirtualizedScrollPane<>(codeArea)), 600, 400);
    scene.getStylesheets().add(JavaKeywordsAsync.class.getResource("xml-highlighting.css").toExternalForm());
    primaryStage.setScene(scene);
    primaryStage.setTitle("XML Editor Demo");
    primaryStage.show();
  }

  private static StyleSpans> computeHighlighting(String text)
  {

    Matcher matcher = XML_TAG.matcher(text);
    int lastKwEnd = 0;
    StyleSpansBuilder> spansBuilder = new StyleSpansBuilder<>();
    while (matcher.find())
    {

      spansBuilder.add(Collections.emptyList(), matcher.start() - lastKwEnd);
      if (matcher.group("COMMENT") != null)
      {
        spansBuilder.add(Collections.singleton("comment"), matcher.end() - matcher.start());
      }
      else
      {
        if (matcher.group("ELEMENT") != null)
        {
          String attributesText = matcher.group(GROUP_ATTRIBUTES_SECTION);

          spansBuilder.add(Collections.singleton("tagmark"), matcher.end(GROUP_OPEN_BRACKET) - matcher.start(GROUP_OPEN_BRACKET));
          spansBuilder.add(Collections.singleton("anytag"), matcher.end(GROUP_ELEMENT_NAME) - matcher.end(GROUP_OPEN_BRACKET));

          if (!attributesText.isEmpty())
          {

            lastKwEnd = 0;

            Matcher amatcher = ATTRIBUTES.matcher(attributesText);
            while (amatcher.find())
            {
              spansBuilder.add(Collections.emptyList(), amatcher.start() - lastKwEnd);
              spansBuilder.add(Collections.singleton("attribute"), amatcher.end(GROUP_ATTRIBUTE_NAME) - amatcher.start(GROUP_ATTRIBUTE_NAME));
              spansBuilder.add(Collections.singleton("tagmark"), amatcher.end(GROUP_EQUAL_SYMBOL) - amatcher.end(GROUP_ATTRIBUTE_NAME));
              spansBuilder.add(Collections.singleton("avalue"), amatcher.end(GROUP_ATTRIBUTE_VALUE) - amatcher.end(GROUP_EQUAL_SYMBOL));
              lastKwEnd = amatcher.end();
            }
            if (attributesText.length() > lastKwEnd)
            {
              spansBuilder.add(Collections.emptyList(), attributesText.length() - lastKwEnd);
            }
          }

          lastKwEnd = matcher.end(GROUP_ATTRIBUTES_SECTION);

          spansBuilder.add(Collections.singleton("tagmark"), matcher.end(GROUP_CLOSE_BRACKET) - lastKwEnd);
        }
      }
      lastKwEnd = matcher.end();
    }
    spansBuilder.add(Collections.emptyList(), text.length() - lastKwEnd);
    return spansBuilder.create();
  }

}