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import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class CheckHatenaID {
public static void main (String[] args) {
String hatenaID = "shogonir";
Pattern p = Pattern.compile("[a-zA-Z][a-zA-Z0-9_\\-]{1,30}[a-zA-Z0-9]");
Matcher m = p.matcher(hatenaID);
boolean f = m.matches();
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