java正则表达式测试工具

import javax.swing.*;   
import javax.swing.text.DefaultHighlighter;   
import javax.swing.text.BadLocationException;   
import java.awt.BorderLayout;   
import java.awt.Font;   
import java.awt.HeadlessException;   
import java.awt.Color;   
import java.awt.event.ActionEvent;   
import java.awt.event.ActionListener;   
import java.util.regex.Pattern;   
import java.util.regex.Matcher;   
    
/** 
* 测试 Java 正则表达式 
*/   
public class RegTester {   
    
    public static void main(String[] args) {   
        try {   
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());   
        } catch (Exception e) {   
            e.printStackTrace();   
        }   
    
        new RegTesterFrame().setVisible(true);   
    }   
}   
    
class RegTesterFrame extends JFrame {   
    
    private JTextField textbox = new JTextField();  // 包含测试文本的文本域   
        
    private JTextArea textarea = new JTextArea();   // 包含正则表达式的文本框   
    
    private RegTesterFrame thisFrame = this;   
        
    private DefaultHighlighter.DefaultHighlightPainter highlightPainter =   
            new DefaultHighlighter.DefaultHighlightPainter(Color.green);   
    
    // 构造方法   
    RegTesterFrame() throws HeadlessException {   
        super("测试 Java 正则表达式");   
        setSize(500, 300);   
        setLocation(300, 100);   
        setDefaultCloseOperation(EXIT_ON_CLOSE);   
    
        setupComponents();   
    }   
    
    // 初始化控件   
    private void setupComponents() {   
        setupBorder();   
    
        JPanel topPanel = new JPanel(new BorderLayout(5, 0));   
        this.add(topPanel, BorderLayout.NORTH);   
        setupTopPanel(topPanel);   
    
        JPanel centerPanel = new JPanel(new BorderLayout());   
        this.add(centerPanel, BorderLayout.CENTER);   
        setupCenterPanel(centerPanel);   
    }   
    
    // 给窗体面板加上边框   
    private void setupBorder() {   
        JPanel panel = new JPanel(new BorderLayout(5, 5));   
        panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));   
        this.setContentPane(panel);   
    }   
    
    // 文本域面板   
    private void setupCenterPanel(JPanel panel) {   
        textarea.setFont(new Font(Font.DIALOG_INPUT, 0, 12));   
        panel.add(new JScrollPane(textarea));   
    }   
    
    // 上方面板   
    private void setupTopPanel(JPanel panel) {   
        textbox.setFont(new Font(Font.DIALOG_INPUT, 0, 12));   
        panel.add(textbox, BorderLayout.CENTER);   
    
        JButton button = new JButton("测试");   
        button.addActionListener(new ActionListener() {   
            public void actionPerformed(ActionEvent e) {   
                checkRegularExpression();   
            }   
        });   
        panel.add(button, BorderLayout.EAST);   
        panel.add(new JLabel("正则表达式："), BorderLayout.WEST);   
    }   
    
    // 检查正则表达式   
    private void checkRegularExpression() {   
        textarea.getHighlighter().removeAllHighlights();   
    
        String reg = textbox.getText();   
        String text = textarea.getText();   
    
        Pattern p = Pattern.compile(reg);   
        Matcher m = p.matcher(text);   
        if (m.find()) {   
            thisFrame.setTitle("文本符合表达式。");   
            highlightMatches(m);   
        } else {   
            thisFrame.setTitle("文本不符合表达式。");   
        }   
    }   
    
    // 将符合正则表达式的部分高亮显示   
    private void highlightMatches(Matcher m) {   
        highlight(m);   
        int start = m.end();   
        while (m.find(start)) {   
            highlight(m);   
            start = m.end();   
        }   
    }   
    
    private void highlight(Matcher m) {   
        try {   
            textarea.getHighlighter().addHighlight(m.start(), m.end(), highlightPainter);   
        } catch (BadLocationException e) {   
            e.printStackTrace();   
        }   
    }   
}