How do I write character class intersection regex?

By I Wayan Saryada in Regex 0 Comment

You can use the && operator to combine classes that define a sets of characters. It will only match characters common to both classes (intersection).

package org.kodejava.regex;

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

public class CharacterClassIntersectionDemo {
    public static void main(String[] args) {
        // Define regex that will search characters from 'a' to 'z'
        // and is a 'c' or 'a' or 't' character.
        String regex = "[a-z&&[cat]]";

        // Compiles the given regular expression into a pattern.
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(
                "The quick brown fox jumps over the lazy dog");

        // Find every match and print it
        while (matcher.find()) {
            System.out.format("Text \"%s\" found at %d to %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
        }
    }
}

The program print the following result:

Text "c" found at 7 to 8.
Text "t" found at 31 to 32.
Text "a" found at 36 to 37.

How do I write simple character class regex?

By I Wayan Saryada in Regex 0 Comment

A character class in the context of regular expression is a set of characters enclosed within a square brackets "[]". It specifies the characters that will successfully match a single character from the given input.

A simple class, the most basic form of character class, is formed simply by placing a set of characters side-by-side within square brackets. For example the regular expression b[ai]t will match the words "bit" or "bat" because the pattern defines a character class accepting either "i" or "a" as the middle character.

package org.kodejava.regex;

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

public class CharacterClassesSimpleClassDemo {
    public static void main(String[] args) {
        // Creating a simple class type of character classes.
        // The regular expression below will search all sequences
        // of string that begins with 'b', ends with 't' and have
        // a middle letter of 'a' or 'i'.
        String regex = "b[ai]t";

        // Compiles the pattern and obtains the matcher object.
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher =
                pattern.matcher("I'm a little bit afraid of bats " +
                        "but not cats.");

        // Find every match and prints it.
        while (matcher.find()) {
            System.out.format("Text \"%s\" found at %d to %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
        }
    }
}

The program will print the following output:

Text "bit" found at 13 to 16.
Text "bat" found at 27 to 30.

How do I write negated character class regex?

By I Wayan Saryada in Regex 0 Comment

A negation class is a character class that begins with a ^ metacharacter which will exclude a set of defined characters within a square brackets. For example the negation class h[^ao]t in the example below match only the word hit and exclude the words hat and hot.

package org.kodejava.regex;

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

public class CharacterClassesNegationClassDemo {
    public static void main(String[] args) {
        // Defines a regular expression that will search all
        // sequences of string that begin with 'h' and end with 't'
        // and have a middle letter except those appearing to the
        // right of the ^ character within the square brackets
        // ('a' and 'o')
        String regex = "h[^ao]t";

        // Compiles the pattern and obtains the matcher object.
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher =
                pattern.matcher("Wow, that hot hat will make a hit");

        // Find every match and prints it.
        while (matcher.find()) {
            System.out.format("Text \"%s\" found at %d to %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
        }
    }
}

The program output the following result:

Text "hit" found at 30 to 33.

How do I write range character class regex?

By I Wayan Saryada in Regex 0 Comment

To define a character class that includes a range of values, put - metacharacter between the first and last character to be matched. For example [a-e]. You can also specify multiple ranges like this [a-zA-Z]. This will match any letter of the alphabet from a to z (lowercase) or A to Z (uppercase).

In the example below we are matching the word that begins with bat and ends with a single number that have a value range from 3 to 7.

package org.kodejava.regex;

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

public class CharacterClassesRangeClassDemo {
    public static void main(String[] args) {
        // Defines regex that will search all sequences of string
        // that begin with bat and number which range [3-7]
        String regex = "bat[3-7]";
        String input =
                "bat1, bat2, bat3, bat4, bat5, bat6, bat7, bat8";

        // Compiles the given regular expression into a pattern.
        Pattern pattern = Pattern.compile(regex);

        // Creates a matcher that will match the given input
        // against this pattern.
        Matcher matcher = pattern.matcher(input);

        // Find every match and prints it.
        while (matcher.find()) {
            System.out.format("Text \"%s\" found at %d to %d.%n",
                    matcher.group(), matcher.start(),
                    matcher.end());
        }
    }
}

The program will match the following string from the input:`

Text "bat3" found at 12 to 16.
Text "bat4" found at 18 to 22.
Text "bat5" found at 24 to 28.
Text "bat6" found at 30 to 34.
Text "bat7" found at 36 to 40.

How do I set and get the contents of JTextArea?

By I Wayan Saryada in Swing 0 Comment

To set and get the contents of a JTextArea you can use the setText(String text) and getText() methods. In the code below we create a JTextArea and sets its contents after we create a new instance of JTextArea. To get the contents we use the action on a button. When the button is pressed the contents of the JTextArea is read using the getText() method. This method return a String object.

package org.kodejava.swing;

import javax.swing.*;
import java.awt.*;

public class TextAreaGetContent extends JPanel {
    public TextAreaGetContent() {
        initializeUI();
    }

    public static void showFrame() {
        JPanel panel = new TextAreaGetContent();
        panel.setOpaque(true);

        JFrame frame = new JFrame("JTextArea Demo");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(TextAreaGetContent::showFrame);
    }

    private void initializeUI() {
        this.setLayout(new BorderLayout());
        this.setPreferredSize(new Dimension(500, 200));

        final JTextArea textArea = new JTextArea();

        // Set the contents of the JTextArea.
        String text = "The quick brown fox jumps over the lazy dog.";
        textArea.setText(text);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);

        JScrollPane pane = new JScrollPane(textArea);
        pane.setPreferredSize(new Dimension(500, 200));
        pane.setVerticalScrollBarPolicy(
                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

        JButton button = new JButton("Get Contents");
        button.addActionListener(e -> {
            // Get the contents of the JTextArea component.
            String contents = textArea.getText();
            System.out.println("contents = " + contents);
        });

        this.add(pane, BorderLayout.CENTER);
        this.add(button, BorderLayout.SOUTH);
    }
}

The output of the code snippet above is:

Set and Get the Content of JTextArea