Check if line starts with a number in java using regex

public class TestLineForDigit {

public static void main(String[] args) {
String linePattern = "5 B+ tree. Because in B+ tree,  all the data is stored only in leaf nodes.";

if (linePattern.matches("\\d.*")) 
 System.out.println("true");  // print true if line found any [0-9] number in beginning 

else 
 System.out.println("false"); // print false if expression does not match start digit value

}
}