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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("\\d");
Matcher matcher = p.matcher("5");
boolean isOk = matcher.matches();
System.out.println("original pattern matches " + isOk);
// recycle the pattern
String tmp = p.pattern();
Pattern p2 = Pattern.compile(tmp);
matcher = p.matcher("5");
isOk = matcher.matches();
System.out.println("second pattern matches " + isOk);
}
}
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