如何将下面数据中的字母以及空行去掉，只保留数字？

Question

   NODE        X                   Y                   Z
       1     0.00000000000      0.150000000000E-02   0.00000000000    
       2     0.00000000000       0.00000000000       0.00000000000    
       3     0.00000000000      0.148500000000E-02   0.00000000000    
       4     0.00000000000      0.147000000000E-02   0.00000000000    
       5     0.00000000000      0.145500000000E-02   0.00000000000    
       6     0.00000000000      0.144000000000E-02   0.00000000000    
       7     0.00000000000      0.142500000000E-02   0.00000000000    
       8     0.00000000000      0.141000000000E-02   0.00000000000    
       9     0.00000000000      0.139500000000E-02   0.00000000000    
      10     0.00000000000      0.138000000000E-02   0.00000000000    
      11     0.00000000000      0.136500000000E-02   0.00000000000    
      12     0.00000000000      0.135000000000E-02   0.00000000000    
      13     0.00000000000      0.133500000000E-02   0.00000000000    
      14     0.00000000000      0.132000000000E-02   0.00000000000    
      15     0.00000000000      0.130500000000E-02   0.00000000000    
      16     0.00000000000      0.129000000000E-02   0.00000000000    
      17     0.00000000000      0.127500000000E-02   0.00000000000    
      18     0.00000000000      0.126000000000E-02   0.00000000000    
      19     0.00000000000      0.124500000000E-02   0.00000000000    
      20     0.00000000000      0.123000000000E-02   0.00000000000       NODE        X                   Y                   Z
      21     0.00000000000      0.121500000000E-02   0.00000000000    
      22     0.00000000000      0.120000000000E-02   0.00000000000    
      23     0.00000000000      0.118500000000E-02   0.00000000000    
      24     0.00000000000      0.117000000000E-02   0.00000000000    
      25     0.00000000000      0.115500000000E-02   0.00000000000    
      26     0.00000000000      0.114000000000E-02   0.00000000000    
      27     0.00000000000      0.112500000000E-02   0.00000000000    
      28     0.00000000000      0.111000000000E-02   0.00000000000    
      29     0.00000000000      0.109500000000E-02   0.00000000000    
      30     0.00000000000      0.108000000000E-02   0.00000000000    
      31     0.00000000000      0.106500000000E-02   0.00000000000    
      32     0.00000000000      0.105000000000E-02   0.00000000000    
      33     0.00000000000      0.103500000000E-02   0.00000000000    
      34     0.00000000000      0.102000000000E-02   0.00000000000    
      35     0.00000000000      0.100500000000E-02   0.00000000000    
      36     0.00000000000      0.990000000000E-03   0.00000000000    
      37     0.00000000000      0.975000000000E-03   0.00000000000    
      38     0.00000000000      0.960000000000E-03   0.00000000000    
      39     0.00000000000      0.945000000000E-03   0.00000000000    
      40     0.00000000000      0.930000000000E-03   0.00000000000

Answer 1

public static void main(String[] args) {
String string = "0.1230000 00000E-02";
string = string.replaceAll("([^0-9.\\t\\n\\x0B\\f\\r])", "");
System.out.println("输出：0.12300000000002========="+string);
}