import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^[\\s\\S]*?(?=\\n{2,})";
final String string = "The War of the Worlds\n"
+ "10-10-2020\n\n"
+ "I.\n"
+ "THE EVE OF THE WAR.\n\n"
+ "No one would have believed in the last years of the nineteenth century\n"
+ "that this world was being watched keenly and closely by intelligences\n"
+ "greater than man’s and yet as mortal as his own; that as men busied\n"
+ "themselves about their various concerns they were scrutinised and\n"
+ "studied, perhaps almost as narrowly as a man with a microscope might\n"
+ "scrutinise the transient creatures that swarm and multiply in a drop of\n"
+ "water. With infinite complacency men went to and fro over this globe\n"
+ "about their little affairs, serene in their assurance of their empire\n"
+ "over matter. It is possible that the infusoria under the microscope do\n"
+ "the same. No one gave a thought to the older worlds of space as sources\n"
+ "of human danger, or thought of them only to dismiss the idea of life\n"
+ "upon them as impossible or improbable. It is curious to recall some of\n"
+ "the mental habits of those departed days. At most terrestrial men\n"
+ "fancied there might be other men upon Mars, perhaps inferior to\n"
+ "themselves and ready to welcome a missionary enterprise. Yet across the\n"
+ "gulf of space, minds that are to our minds as ours are to those of the\n"
+ "beasts that perish, intellects vast and cool and unsympathetic,\n"
+ "regarded this earth with envious eyes, and slowly and surely drew their\n"
+ "plans against us. And early in the twentieth century came the great\n"
+ "disillusionment.\n";
final Pattern pattern = Pattern.compile(regex);
final Matcher matcher = pattern.matcher(string);
if (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