JavaScript匹配函数返回null

我正在为Android游戏Word小吃在android上创建一个程序。它会比较文件中搜索到的字符串和单词（还不是来自文件，只是用字符串进行测试）（请参阅规则）。在线"Script Error: Cannot read property 'length' of null"：但是，无论我做什么，我仍然得到错误JavaScript匹配函数返回null

if((from_file.match(new RegExp(from_file[i], "g") || [])).length != (searched.match(new RegExp(from_file[i], "g") || [])).length)

在功能compare_words(from_file, searched)。我正在使用(string.match(new RegExp(searched_str, "g") || [])).length来查找堆栈溢出时已经显示的字符串中出现的次数。但我仍然在犯这个错误。有谁能够帮助我？比你。：d

function OnStart() 
{ 
    lay = app.CreateLayout("linear", ""); 
    var from_file = "dedo"; 
    var searched = "odod"; 
    if(compare_words(from_file, searched) == true) 
    { 
     txt = app.CreateText(from_file + ": true"); 
     txt.SetTextSize(32); 
     lay.AddChild(txt); 
    } 
    app.AddLayout(lay); 
} 


function compare_words(from_file, searched) 
{ 
    if(from_file.length == searched.length) 
    { 
     var b = 0; 
     for(i = 0; i < from_file.length; i++) 
     { 
      if((from_file.match(new RegExp(from_file[i], "g") || [])).length != (searched.match(new RegExp(from_file[i], "g") || [])).length) 
      { 
       b = 1; 
       break; 
      } 
     } 
     if(b == 0) 
     { 
      return true 
     } 
     else 
     { 
      return false 
     } 
    } 
    else 
    { 
     return false 
    } 
}

来源

2017-10-11 tomas

不

(from_file.match(new RegExp(from_file[i], "g") || [])).length

但

(from_file.match(new RegExp(from_file[i], "g")) || []).length

您是or荷兰国际集团正则表达式，而不是比赛结果。

来源

2017-10-11 18:53:31

JavaScript匹配函数返回null

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