hokamoto/Temp.java

## Temp.java
import java.util.regex.Pattern;

public class Temp {
    public static void main(String[] args) {
        System.out.println(Pattern.compile("^0$|^0^[0-9]+|^[1-9][0-9]*").matcher("0^1").find());
    }
}
	import java.util.regex.Pattern;

	public class Temp {
	public static void main(String[] args) {
	System.out.println(Pattern.compile("^0$\|^0^[0-9]+\|^[1-9][0-9]*").matcher("0^1").find());
	}
	}