import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "\\b\"{0,1}[A-Z0-9_][A-Z0-9._%+-]*[A-Z0-9_]\\@(?![. \\-])(([A-Z0-9-]+\\.)+[A-Z]{2,8}|\\[{0,1}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\]{0,1})\\b";
final String string = "invalid formats\n"
+ "cf+2@3465456rteyaesrgrdsfgsdfg@thefloow.com\n"
+ "@@@\n"
+ "Leading dot in address eg .cf@thefloow.com\n"
+ "Trailing dot in address eg cf+.@thefloow.com\n"
+ "Multiple dots eg cf+..1@thefloow.com\n"
+ "Leading dash in front of domain eg cf@-thefloow.com\n"
+ "invalid top level domain names eg cf@thefloow.web\n"
+ "Multiple dots in the domain portion cf@thefloow..com\n"
+ "plainaddress Missing @ sign and domain\n"
+ "#@%^%#$@#$@#.com Garbage \n"
+ "@domain.com Missing username\n"
+ "Joe Smith <email@domain.com> Encoded html within email is invalid\n"
+ "email.domain.com Missing @\n"
+ "email@domain@domain.com Two @ sign \n"
+ ".email@domain.com Leading dot in address is not allowed\n"
+ "email.@domain.com Trailing dot in address is not allowe\n"
+ "email..email@domain.com Multiple dots\n"
+ "あいうえお@domain.com Unicode char as address \n"
+ "email@domain.com (Joe Smith) Text followed email is not allowed\n"
+ "email@domain Missing top level domain (.com/.net/.org/etc)\n"
+ "email@-domain.com Leading dash in front of domain is invalid \n"
+ "email@domain.web .web is not a valid top level domain\n"
+ "email@111.222.333.44444 Invalid IP format\n"
+ "email@domain..com Multiple dot in the domain portion is invalid\n"
+ "plainaddress\n"
+ "#@%^%#$@#$@#.com\n"
+ "@example.com\n"
+ "Joe Smith <email@example.com>\n"
+ "email.example.com\n"
+ "email@example@example.com\n"
+ ".email@example.com\n"
+ "email.@example.com\n"
+ "email..email@example.com\n"
+ "あいうえお@example.com\n"
+ "email@example.com (Joe Smith)\n"
+ "email@example\n"
+ "email@-example.com\n"
+ "email@example.web\n"
+ "email@111.222.333.44444\n"
+ "email@111.222.333.244\n"
+ "email@01.222.233.244\n"
+ "email@example..com\n"
+ "Abc..123@example.com\n"
+ "“(),:;<>[\\]@example.com\n"
+ "just\"not\"right@example.com\n"
+ "this\\ is\"really\"not\\allowed@example.com\n\n"
+ " \n"
+ "valid formats\n"
+ "ip address as domain name eg cf@192.168.0.1\n"
+ "quoted strings eg \"cf\"@thefloow.com \n"
+ "email@domain.com Valid email \n"
+ "firstname.lastname@domain.com Email contains dot in the address field \n"
+ "email@subdomain.domain.com Email contains dot with subdomain \n"
+ "firstname+lastname@domain.com Plus sign is considered valid character \n"
+ "email@123.123.123.123 Domain is valid IP address \n"
+ "email@[123.123.123.123] Square bracket around IP address is considered valid\n"
+ "\"email\"@domain.com Quotes around email is considered valid \n"
+ "1234567890@domain.com Digits in address are valid \n"
+ "email@domain-one.com Dash in domain name is valid \n"
+ "_______@domain.com Underscore in the address field is valid \n"
+ "email@domain.name .name is valid Top Level Domain name \n"
+ "email@domain.co.jp Dot in Top Level Domain name also considered valid (use co.jp as example here)\n"
+ "firstname-lastname@domain.com Dash in address field is valid\n"
+ "email@example.com\n"
+ "firstname.lastname@example.com\n"
+ "email@subdomain.example.com\n"
+ "firstname+lastname@example.com\n"
+ "email@123.123.123.0\n"
+ "email@[123.123.0.123]\n"
+ "email@123.0.123.123\n"
+ "email@[0.123.123.123]\n"
+ "“email”@example.com\n"
+ "1234567890@example.com\n"
+ "email@example-one.com\n"
+ "_______@example.com\n"
+ "email@example.name\n"
+ "email@example.museum\n"
+ "email@example.co.jp\n"
+ "3465456rteyaesrgrdsfgsdfg@thefloow.com\n"
+ "firstname-lastname@example.com\n"
+ "much.“more\\ unusual”@example.com\n"
+ "very.unusual.“@”.unusual.com@example.com\n"
+ "very.“(),:;<>[]”.VERY.“very@\\\\ \"very”.unusual@strange.example.com";
final Pattern pattern = Pattern.compile(regex, 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