import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^\n"
+ "(?<DAY>d-[0-9]{1,2}|([12][0-9]|3[01]|0[1-9]|[1-9])|d)\n"
+ "(?<MONTH>m-[0-9]{1,2}|(0[1-9]|1[012])|m)\n"
+ "(?<YEAR>y-[0-9]{1,2}|([12][09][0-9][0-9])|y)\n"
+ "$";
final String string = "";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE | Pattern.COMMENTS);
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