import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^(?=.{10,255}$)(?=.{4,64}@)[A-z0-9]+(?:[.-][A-z0-9]+)*@[A-z0-9]+(?:[.-][A-z0-9]+)*\\.[A-z]+$";
final String string = "a-b.de@fn.cdpdodo\n\n"
+ "-abde@fn.co\n"
+ "_abde@_fn.co\n"
+ ".abde@fn.co\n"
+ "abde_@fn.co\n"
+ "ab_de@_f------n.co\n\n"
+ "abdسيبe@fn.co\n"
+ "abde@fn.co\n"
+ "ab_nnnn___0---....................-----de@fn.f.co\n"
+ "abde@.fn.f.co\n"
+ ".......abde@fn.f.co\n"
+ "fkb-----kkkabde@fn.f.co\n"
+ "f3.f3.f3.f3.fff3@gmail.com\n"
+ "qowijdoqiwjdoqwi@coeoicmoei.ecpomep.d.docimequo\n"
+ "a23456789a123456789b123456789c123456789d123456789e123456789f1234@ex.com\n"
+ "a23456789a123456789b123456789c123456789d123456789e123456789f12345@ex.com \n\n"
+ "wijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwijwijdoqiwjdoqwij@coeo444--icmoei.ecpomepocime\n\n"
+ "wijdoqiwjdoqwij@coeo444--icmoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecpommoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecoei.ecpomepocime\n\n"
+ "wijdoqiwjdoqwij@coeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmoei.ecpomepocime\n\n"
+ "wijdoqiwjdoqwij@coeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmeo444--icmoei.ecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocimeecpomepocime\n\n"
+ "[\\w.-]{2,}\\.[A-z]{2,}\n"
+ "^[A-z0-9][\\w.-]{0,64}[A-z0-9]@(?:[A-z0-9-]{1,63}\\.){1,3}[A-z]{2,63}$";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.UNICODE_CASE);
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