JavaScript 複数の文字列をAND検索で探し出したい

search.js

/*
 *  複数の文字列をAND検索で探し出したい
 *  大文字小文字も区別しない
 */
var line  = ["1tEst","test2","3test"];
var search_string = "teSt 2";
var match_flag = isMatchMulti(line,search_string);

function isMatchMulti(line,search_string) {
  var separatorString = /\s+/;
  var arrayStrig = search_string.split(separatorString);  
  var match = new Array();
  for(var i = 0 ; i < arrayStrig.length; i++ ){
    reg = new RegExp("(?=.*" + arrayStrig[i] + ")","i");
    match[i] = false;      
    for(var j = 0 ; j < line.length; j++ ){
        if(line[j].match(reg)){
          match[i] = true;
        }
    }   
  }
  var match_flag = false;
  if(0 < match.length){
    match_flag = true;
  }else{
    match_flag = false;
  }
  for(var ii = 0 ; ii < match.length; ii++ ){
    if(match[ii] == false){
      match_flag = false;
    }
  }
  return match_flag;
}