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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
public static void main(String[] args) {
String[] array = { "aa3AA", "aaAA", "bb3BB", "bbBB" };
Pattern pattern = Pattern.compile("(a{2}A{2})|(b{2}B{2})");
Matcher matcher = null;
for (String str : array) {
matcher = pattern.matcher(str);
if (matcher.find())
System.out.println("true");
else
System.out.println("false");
}
}
}