.*\bEU\b.*
public static void main(String[] args) {
String regex = ".*\\bEU\\b.*";
String text = "EU is an acronym for EUROPE";
//String text = "EULA should not match";
if(text.matches(regex)) {
System.out.println("It matches");
} else {
System.out.println("Doesn't match");
}
}