Java:
การใช้เรกุลาร์เอ็กเพรสชัน

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

public class RegexExample {
    public static void main(String[] args) {
        String text = "Regex is great for parsing. Parsing with regex is powerful.";
        String wordToFind = "parsing";
        
        Pattern pattern = Pattern.compile(wordToFind, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(text);
        
        while (matcher.find()) {
            System.out.println("พบ '" + matcher.group() + "' ที่ตำแหน่ง " + matcher.start());
        }
    }
}

public class SplitExample {
    public static void main(String[] args) {
        String text = "Java,Python,Ruby,JavaScript";
        String[] languages = text.split(",");
        
        for (String language : languages) {
            System.out.println(language);
        }
    }
}

import org.apache.commons.lang3.StringUtils;

public class CommonsLangExample {
    public static void main(String[] args) {
        String text = "Regex makes text processing easier. Processing text with regex is efficient.";
        String substring = "processing";
        
        int count = StringUtils.countMatches(text, substring);
        System.out.println("'" + substring + "' ปรากฏ " + count + " ครั้ง.");
    }
}

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.12.0</version> <!-- ตรวจสอบเวอร์ชันล่าสุด -->
</dependency>