import java.util.regex.Pattern;
 
class Ideone {
    public static final Pattern PATTERN =
            Pattern.compile("^-?(?:[1-9]\\d*|0)(?:.\\d*[0-9])?, -?(?:[1-9]\\d*|0)(?:.\\d*[0-9])?$");
 
    public static void main(final String[] args) {
        System.out.println(isGpsCoordinate("0.0, 0.0"));
        System.out.println(isGpsCoordinate("New York"));
        System.out.println(isGpsCoordinate("東京"));
    }
 
    private static boolean isGpsCoordinate(final String input) {
        return PATTERN.matcher(input).matches();
    }
}

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