import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "\\s*(byte|short|int|long|float|double|char|boolean|[A-Z][a-zA-z]+)\\s*(\\[\\])*\\s+([\\w]+)\\s*((,\\s*[\\w]+)*)\\s*;";
final String string = "\n"
+ "int a, ss, f ;\n"
+ "char g;\n"
+ "byte f_123 ; double pi;\n"
+ "String string;\n\n"
+ "Object[] array1;\n"
+ "int [] array2, array3;";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html