import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?:^(\\w{1,255}):(.{1,255})@|^)(?:(?:(?=\\S{0,253}(?:$|:| ))((?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\\.)+(?:[a-z0-9]{1,63})))|localhost)(:\\d{1,5})?";
final String string = "Valid localhost addresses:\n"
+ "localhost\n"
+ "user:password@localhost:80\n"
+ "localhost:8080/path/to/page.html\n\n\n"
+ "Valid IPv4 addresses:\n"
+ "10.10.0.1 \n"
+ "192.168.0.1 \n"
+ "192.168.0.1:8888 \n"
+ "user:password@192.168.0.1:8888 \n"
+ "user:password@192.168.0.1\n\n\n"
+ "Valid IPv6 addresses: // regex does not check for that, check here: http://vernon.mauery.com/content/projects/linux/ipv6_regex\n\n"
+ "100::\n"
+ "100::ffff:ffff:ffff:ffff\n"
+ "::ffff:0.0.0.0\n"
+ "64:ff9b::0.0.0.0\n"
+ "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff\n"
+ "fe80::\n"
+ "2001:2f:ffff:ffff:ffff:ffff:ffff:ffff\n"
+ "2001:db8::\n"
+ "::1\n\n\n"
+ "Valid domains: // all should work\n"
+ "www.test.com\n"
+ "www1.test.com\n"
+ "www1.test.com:8080 \n"
+ "test.com\n"
+ "test-test.com\n"
+ "test.com/path/to/page?var=1&var2=2\n"
+ "test.com:80\n"
+ "user:password@test.com\n"
+ "user:password@test-test.com\n"
+ "user:password@test.com/path/to/page\n"
+ "user:password@test.com/path/to/page?var=1&var2=2\n"
+ "user:password@test.com:80\n"
+ "user:password@test.com:80/path/to/page?var=1&var2=2\n"
+ "Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.com\n"
+ "user:password@Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.com\n"
+ "user:password@Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.com:8080\n"
+ "Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.MaximumLengthOf63CharactersForATopLevelDomainWithoutTheDashes\n"
+ "Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.MaximumLengthOf63CharactersForATopLevelDomainWithoutTheDashes:8888\n"
+ "user:password@Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.Maximum-Length-Of-63-Characters-For-A-Subdomain-Completely-Used.MaximumLengthOf63CharactersForATopLevelDomainWithoutTheDashes:8888\n"
+ "a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a // Maximum number of 127 suddomains, seperated by 126 dots\n\n\n"
+ "Invalid domains: // should not work\n"
+ "justLongGibberishBLABLABLA \n"
+ "againButThisTimeWithNumbers12345675678797 \n"
+ "ShouldNOTWorkBecauseOfTheDash-.com\n"
+ "UrlLenghtIsValidButThisSubdomainIsTooLongMaximumForASubdomainIs63Characters.com \n"
+ "This-Url-Has-Valid-Subdomains.But-The-Url-Length-In-General-Is-Too-Long.This-Means-Longer-Than-253-Characters-For-The-Complete-Url.Including-The-Top-Level-Domain-Itself.So-This-Line-Shouldnt-Be-Catched-By-The-Regex.Its-Exactly-One-Character-Too-Long1.com";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE);
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