import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?:https?:)?(?:\\/\\/)?(?:[0-9A-Z-]+\\.)?(?:youtu\\.be\\/|youtube(?:-nocookie)?\\.com\\S*?[^\\w\\s-])([\\w-]{11})(?=[^\\w-]|$)(?![?=&+%\\w.-]*(?:['\"][^<>]*>|<\\/a>))[?=&+%\\w.-]*";
final String string = "thisdoesnotmatch\n"
+ "seulement11\n"
+ "l_la5XiQJdk\n\n"
+ "http://www.youtube.com/watch?v=vpiMAaPTze8\n"
+ "http://youtu.be/l_la5XiQJdk\n"
+ "http://youtu.be/NLqAF9hrVbY\n"
+ "https://youtu.be/qT47KF5pvfw\n"
+ "https://youtu.be/zImHyTyYhM8?t=4s\n"
+ "http://www.youtube.com/v/NLqAF9hrVbY?fs=1&hl=en_US\n"
+ "http://www.youtube.com/v/NLqAF9hrVbY?fs=1&hl=en_US\n"
+ "http://www.youtube.com/watch?v=NLqAF9hrVbY\n"
+ "http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo\n"
+ "http://www.youtube.com/ytscreeningroom?v=NRHVzbJVx8I\n"
+ "http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/2/PPS-8DMrAn4\n"
+ "http://gdata.youtube.com/feeds/api/videos/NLqAF9hrVbY\n"
+ "http://www.youtube.com/watch?v=spDj54kf-vY&feature=g-vrec\n"
+ "http://www.youtube.com/watch?v=spDj54kf-vY&feature=youtu.be\n"
+ "http://www.youtube-nocookie.com/watch?v=NLqAF9hrVbY\n"
+ "http://www.youtube.com/embed/NLqAF9hrVbY\n"
+ "https://www.youtube.com/embed/NLqAF9hrVbY\n"
+ "https://www.youtube.com/watch?v=MRl7cxSOXdU&feature=youtu.be\n"
+ "https://www.youtube.com/watch?v=q07SQFmL4rM\n"
+ "https://www.youtube.com/watch?v=q07SQFmL4yM\n"
+ "https://www.youtube.com/watch?time_continue=4&v=zImHyTyYhM8\n"
+ "http://www.youtube.com/embed/dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/watch?v=dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/?v=dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/v/dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/e/dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/user/username#p/u/11/dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/0/dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcQ ...\n"
+ "http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcQ ...\n"
+ "https://www.youtube.com/watch?v=DFYRQ_zQ-gk&feature=featured\n"
+ "https://www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "https://youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "https://m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "https://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "http://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "//www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "https://www.youtube.com/embed/DFYRQ_zQ-gk?autoplay=1\n"
+ "https://www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "http://www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "//www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "https://youtube.com/embed/DFYRQ_zQ-gk\n"
+ "http://youtube.com/embed/DFYRQ_zQ-gk\n"
+ "//youtube.com/embed/DFYRQ_zQ-gk\n"
+ "youtube.com/embed/DFYRQ_zQ-gk\n"
+ "https://youtu.be/DFYRQ_zQ-gk?t=120\n"
+ "https://youtu.be/DFYRQ_zQ-gk\n"
+ "http://youtu.be/DFYRQ_zQ-gk\n"
+ "//youtu.be/DFYRQ_zQ-gk\n"
+ "youtu.be/DFYRQ_zQ-gk\n"
+ "https://www.youtube.com/watch?v=DFYRQ_zQ-gk&feature=featured\n"
+ "https://www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "www.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "https://youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "youtube.com/watch?v=DFYRQ_zQ-gk\n\n"
+ "https://m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "http://m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "//m.youtube.com/watch?v=DFYRQ_zQ-gk\n"
+ "m.youtube.com/watch?v=DFYRQ_zQ-gk\n\n"
+ "https://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "http://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "//www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n"
+ "youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US\n\n"
+ "https://www.youtube.com/embed/DFYRQ_zQ-gk?autoplay=1\n"
+ "https://www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "http://www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "//www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "www.youtube.com/embed/DFYRQ_zQ-gk\n"
+ "https://youtube.com/embed/DFYRQ_zQ-gk\n"
+ "http://youtube.com/embed/DFYRQ_zQ-gk\n"
+ "//youtube.com/embed/DFYRQ_zQ-gk\n"
+ "youtube.com/embed/DFYRQ_zQ-gk\n\n"
+ "https://youtu.be/DFYRQ_zQ-gk?t=120\n"
+ "https://youtu.be/DFYRQ_zQ-gk\n"
+ "http://youtu.be/DFYRQ_zQ-gk\n"
+ "//youtu.be/DFYRQ_zQ-gk\n"
+ "youtu.be/DFYRQ_zQ-gk\n\n"
+ "https://www.youtube.com/HamdiKickProduction?v=DFYRQ_zQ-gk\n";
final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | 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