import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^(?:ISBN(?:-13)?:? )?(?<gs1>\\d{3})(?:(?<number>\\d{9})|(?=[\\d -]{14}$)[ -](?<registrationGroup>\\d{1,5})[ -](?<registrant>\\d{1,7})[ -](?<publication>\\d{1,6})[ -])(?<checkDigit>\\d)$";
final String string = "9781861978769\n"
+ "97818619787659\n"
+ "978186197879\n"
+ "978-1-86197-876-9\n"
+ "978-1-86197-87-9\n"
+ "978-1-86197-8765-9\n"
+ "978-186197-876-9\n"
+ "978-186197-8-76-9";
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