import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?<MM>[01]?[0-9])\\/(?<DD>[0-3]?[0-9])\\/(?<YYYY>[0-2][0-9][0-9][0-9])";
final String string = "mm/dd/yyyy Examples\n\n"
+ "01/01/2020 #1st Jan\n"
+ "07/03/2020 #3 July\n"
+ "12/2/2020 #2 December \n"
+ "4/23/2020 #23 April \n"
+ "19/39/2020\n";
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