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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String args[]) {
Pattern p = Pattern.compile("\\w\\d");
String candidate = "A6 is my favorite";
Matcher matcher = p.matcher(candidate);
if (matcher.find()) {
String tmp = matcher.group(0);
System.out.println(tmp);
}
}
}
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