每次我尝试运行此代码在文本文件中查找模式时，都会不断得到“找不到这样的元素”的结果。我想可能是模式不正确，最初使用的是p1和p2，但尝试了p3和p4，没有改变任何东西。

try {
   Scanner scnr = new Scanner(new File(FILENAME));

   //("^(\\d{1}[- .]?){3}$")
   Pattern p1 = Pattern.compile("[0-9]+\\s[0-9]+\\s[0-9]+$");
   Pattern p2 = Pattern.compile("[0-9]+\\s[0-9]+\\s[0-9]+\\s[0-9]+$");
   Pattern p3 = Pattern.compile("^(\\d{1}[ ]?){3}$");
   Pattern p4 = Pattern.compile("^(\\d{1}[ ]?){4}$");

   clear();
   while (scnr.hasNextInt()) {
     if(p3.matcher(scnr.nextLine()).find()){
     Assign a = new Assign(scnr);
     puzzle.assign(a);
     stackUE.push(a);
    } else if(p4.matcher(scnr.nextLine()).find())  
     {
      RelEntry re = new RelEntry(scnr);
      puzzle.addRelation(re);
      stackUE.push(re);
     }
 } scnr.close();
   System.out.println("game loaded from file");
} catch (IOException e) {
   System.out.println("an input output error occurred");
 } 
}