import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "\\[{2}([^|]*?)(?:\\|(.*?))?\\]{2}";
final String string = "A [[2008 Iwate-Miyagi Nairiku earthquake|6.9 magnitude earthquake]] in Iwate Prefecture, Japan, kills 12 and injures more than 400\n\n"
+ "[[December 1]] A triangular [[Conjunction (astronomy)|conjunction]] formed by a new Moon, Venus and Jupiter is a [[Conjunction (astronomy)#2008|prominent sight]] in the evening sky. [[December 2]]\n";
final Pattern pattern = Pattern.compile(regex);
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