java - How to get a Scanner to ignore words between a certain pattern -


i want read input file using scanner, want scanner ignore inside (* ....... *). how do this? i'm taking integers , adding them array list, if there integers inside text want ignore adds too. 

public arraylist<integer> readnumbers(scanner sc)      {         // todo implement readnumbers         arraylist<integer> list = new arraylist<integer>();         while(sc.hasnext())         {             try             {                string temp = sc.next();                list.add(integer.parseint(temp));              }             catch(exception e)             {              }         }          return list;     }

here's example line of text file

(* 21 alabama population in 2013 *) 4802740

i add 21 , 4802740 array list. thought using sc.usedelimiter("("); sc.usedelimiter(")"); can't seem work. thanks!

it seems may looking 

sc.usedelimiter("\\(\\*[^*]*\\*\\)|\\s+");

this regular expression \\(\\*[^*]*\\*\\) represents part

  • \\(\\* - starts (*,
  • \\*\\) - ends *)
  • [^*]* - , have 0 or more non * characters inside.

i added |\\s+ allow 1 or more spaces delimiter (this delimiter used scanners default).

btw using try-catch main part of control flow considered wrong. instead should change code like

while (sc.hasnext()) {     if(sc.hasnextint()) {         list.add(sc.nextint());     } else {         //consume data not interested in          //so scanner move on next tokens         sc.next();     } }

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