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import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
import javafx.application.Application;
import javafx.application.Platform;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
 
 
public class RegexTest extends Application {
 
    /* Define TextArea and TextField as instance variables
     * so they can be used throughout the program.  Not needed
     * in this program, but fairly typical in more complex 
     * programs.
     */
 
	private TextField regexInput;
	private TextField titleInput;
    private TextArea contentInput;
    private TextArea output;
 
    /**
     * Start method builds the GUI and shows the window.
     */
    public void start(Stage stage) {
    	// Initial text for TextField.
        String regex = "Regex Input Here";  
 
    	// Initial text for TextField.
        String title = "Enter Search Text Here";  
 
    	// Initial text for TextArea
        String content =  "Results Will Appear Here";
 
        /* Create and configure the TextField and TextArea */
 
        regexInput = new TextField(regex);
        regexInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
        regexInput.setPrefColumnCount(20);
 
 
 
        titleInput = new TextField(title);
        titleInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
        titleInput.setPrefColumnCount(20);
 
        contentInput = new TextArea();
        contentInput.setText(content);
        contentInput.setFont( Font.font(16) );
        contentInput.setPrefRowCount(6);
        contentInput.setPrefColumnCount(30);
 
        /* A button that will clear the TextArea.  It also selects all of the
         * text in the TextField and gives the focus to the TextField.  If the 
         * user just starts typing at that point, the old text will be deleted
         * and replaced with what the user types.
         */
 
        Button quitButton = new Button("Quit");
        quitButton.setOnAction( e -> {
            Platform.exit();
        });
 
        Button runButton = new Button("Run Regex");
        runButton.setOnAction( e -> {
            findAndReplace();
        });
 
 
 
        HBox buttonBar = new HBox( 20, runButton, quitButton);
        buttonBar.setAlignment(Pos.CENTER);
 
 
        GridPane root = new GridPane();
 
 
        //Adding all elements along with labels
 
 
 
        root.add(regexInput, 1, 0);
 
 
 
        root.add(titleInput, 1, 1);
 
 
 
        root.add(contentInput, 1, 2);
 
 
        root.setStyle("-fx-background-color: #444444");
 
        root.add(buttonBar, 1, 3);
        BorderPane.setMargin(regexInput, new Insets(2,2,0,2));
        BorderPane.setMargin(contentInput, new Insets(2));  // Set margins around components
        BorderPane.setMargin(titleInput, new Insets(2,2,0,2));
 
        /* Add the scene to the window and make it visible. */
 
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.setTitle("Regex Test Harness");
        stage.show();
 
    } // end start()
 
 
 
 
    public void findAndReplace() {
 
        //getting all text input
 
 
 
        //creating a pattern, case sensitive
 
 
 
        //creating a matcher
 
 
        	String regex = titleInput.getText();
            String inputtext = contentInput.getText();
 
        	Pattern pattern = Pattern.compile(regex);                      
            Matcher matcher = pattern.matcher(inputtext);
 
            String done = matcher.group();
 
 
           output.setText(done); 
 
 
    }
 
 
 
 
 
	public static void main(String[] args) {
        launch(args);
    }
 
} 

Main.java:21: error: class RegexTest is public, should be declared in a file named RegexTest.java
public class RegexTest extends Application {
       ^
Main.java:4: error: package javafx.application does not exist
import javafx.application.Application;
                         ^
Main.java:5: error: package javafx.application does not exist
import javafx.application.Platform;
                         ^
Main.java:6: error: package javafx.stage does not exist
import javafx.stage.Stage;
                   ^
Main.java:7: error: package javafx.scene does not exist
import javafx.scene.Scene;
                   ^
Main.java:8: error: package javafx.scene.layout does not exist
import javafx.scene.layout.BorderPane;
                          ^
Main.java:9: error: package javafx.scene.layout does not exist
import javafx.scene.layout.GridPane;
                          ^
Main.java:10: error: package javafx.scene.layout does not exist
import javafx.scene.layout.HBox;
                          ^
Main.java:11: error: package javafx.scene.control does not exist
import javafx.scene.control.TextArea;
                           ^
Main.java:12: error: package javafx.scene.control does not exist
import javafx.scene.control.TextField;
                           ^
Main.java:13: error: package javafx.scene.control does not exist
import javafx.scene.control.Button;
                           ^
Main.java:14: error: package javafx.scene.control does not exist
import javafx.scene.control.Label;
                           ^
Main.java:15: error: package javafx.scene.text does not exist
import javafx.scene.text.Font;
                        ^
Main.java:16: error: package javafx.scene.text does not exist
import javafx.scene.text.FontWeight;
                        ^
Main.java:17: error: package javafx.geometry does not exist
import javafx.geometry.Insets;
                      ^
Main.java:18: error: package javafx.geometry does not exist
import javafx.geometry.Pos;
                      ^
Main.java:21: error: cannot find symbol
public class RegexTest extends Application {
                               ^
  symbol: class Application
Main.java:29: error: cannot find symbol
	private TextField regexInput;
	        ^
  symbol:   class TextField
  location: class RegexTest
Main.java:30: error: cannot find symbol
	private TextField titleInput;
	        ^
  symbol:   class TextField
  location: class RegexTest
Main.java:31: error: cannot find symbol
    private TextArea contentInput;
            ^
  symbol:   class TextArea
  location: class RegexTest
Main.java:32: error: cannot find symbol
    private TextArea output;
            ^
  symbol:   class TextArea
  location: class RegexTest
Main.java:37: error: cannot find symbol
    public void start(Stage stage) {
                      ^
  symbol:   class Stage
  location: class RegexTest
Main.java:49: error: cannot find symbol
        regexInput = new TextField(regex);
                         ^
  symbol:   class TextField
  location: class RegexTest
Main.java:50: error: cannot find symbol
        regexInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
                                            ^
  symbol:   variable FontWeight
  location: class RegexTest
Main.java:50: error: cannot find symbol
        regexInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
                            ^
  symbol:   variable Font
  location: class RegexTest
Main.java:55: error: cannot find symbol
        titleInput = new TextField(title);
                         ^
  symbol:   class TextField
  location: class RegexTest
Main.java:56: error: cannot find symbol
        titleInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
                                            ^
  symbol:   variable FontWeight
  location: class RegexTest
Main.java:56: error: cannot find symbol
        titleInput.setFont( Font.font(null, FontWeight.BOLD, 20) );
                            ^
  symbol:   variable Font
  location: class RegexTest
Main.java:59: error: cannot find symbol
        contentInput = new TextArea();
                           ^
  symbol:   class TextArea
  location: class RegexTest
Main.java:61: error: cannot find symbol
        contentInput.setFont( Font.font(16) );
                              ^
  symbol:   variable Font
  location: class RegexTest
Main.java:71: error: cannot find symbol
        Button quitButton = new Button("Quit");
        ^
  symbol:   class Button
  location: class RegexTest
Main.java:71: error: cannot find symbol
        Button quitButton = new Button("Quit");
                                ^
  symbol:   class Button
  location: class RegexTest
Main.java:73: error: cannot find symbol
            Platform.exit();
            ^
  symbol:   variable Platform
  location: class RegexTest
Main.java:76: error: cannot find symbol
        Button runButton = new Button("Run Regex");
        ^
  symbol:   class Button
  location: class RegexTest
Main.java:76: error: cannot find symbol
        Button runButton = new Button("Run Regex");
                               ^
  symbol:   class Button
  location: class RegexTest
Main.java:83: error: cannot find symbol
        HBox buttonBar = new HBox( 20, runButton, quitButton);
        ^
  symbol:   class HBox
  location: class RegexTest
Main.java:83: error: cannot find symbol
        HBox buttonBar = new HBox( 20, runButton, quitButton);
                             ^
  symbol:   class HBox
  location: class RegexTest
Main.java:84: error: cannot find symbol
        buttonBar.setAlignment(Pos.CENTER);
                               ^
  symbol:   variable Pos
  location: class RegexTest
Main.java:87: error: cannot find symbol
        GridPane root = new GridPane();
        ^
  symbol:   class GridPane
  location: class RegexTest
Main.java:87: error: cannot find symbol
        GridPane root = new GridPane();
                            ^
  symbol:   class GridPane
  location: class RegexTest
Main.java:108: error: cannot find symbol
        BorderPane.setMargin(regexInput, new Insets(2,2,0,2));
                                             ^
  symbol:   class Insets
  location: class RegexTest
Main.java:108: error: cannot find symbol
        BorderPane.setMargin(regexInput, new Insets(2,2,0,2));
        ^
  symbol:   variable BorderPane
  location: class RegexTest
Main.java:109: error: cannot find symbol
        BorderPane.setMargin(contentInput, new Insets(2));  // Set margins around components
                                               ^
  symbol:   class Insets
  location: class RegexTest
Main.java:109: error: cannot find symbol
        BorderPane.setMargin(contentInput, new Insets(2));  // Set margins around components
        ^
  symbol:   variable BorderPane
  location: class RegexTest
Main.java:110: error: cannot find symbol
        BorderPane.setMargin(titleInput, new Insets(2,2,0,2));
                                             ^
  symbol:   class Insets
  location: class RegexTest
Main.java:110: error: cannot find symbol
        BorderPane.setMargin(titleInput, new Insets(2,2,0,2));
        ^
  symbol:   variable BorderPane
  location: class RegexTest
Main.java:114: error: cannot find symbol
        Scene scene = new Scene(root);
        ^
  symbol:   class Scene
  location: class RegexTest
Main.java:114: error: cannot find symbol
        Scene scene = new Scene(root);
                          ^
  symbol:   class Scene
  location: class RegexTest
Main.java:156: error: cannot find symbol
        launch(args);
        ^
  symbol:   method launch(String[])
  location: class RegexTest
49 errors

Standard output is empty