替換並獲取單詞出現次數

Question

我有一個字符串，我想替換特定的單詞，也想計算出現的次數。 例如

"Of course, there are many other open source or commercial tools available.
Twitter typeahead is probably the most important open source alternative."
.replace(/source/g,'<b>source</b>');

這將用<b>source</b>替換所有source ，但我也希望source的出現數也就是2 。

Answer 1

在進行替換調用之前，您可以簡單地執行以下操作：

 var count = ("Of course, there are many other open source or commercial tools available. Twitter typeahead is probably the most important open source alternative.".match(/source/g) || []).length; var replaceString = "Of course, there are many other open source or commercial tools available.Twitter typeahead is probably the most important open source alternative." .replace(/source/g,'<b>source</b>'); alert(count); alert(replaceString); 

Answer 2

function replaceAndCount(str, tofind, rep){

   var _x = str.split(tofind);
   return{
     "count":_x.length-1,
     "str":_x.join(rep)
   };

}

類似於此功能。

現在計數將是

var str = "Of course, there are many other open source or commercial tools available.
Twitter typeahead is probably the most important open source alternative.";
var count = replaceAndCount(str, "source", "<b>source</b>").count;

和新的字符串將是

var newString = replaceAndCount(str, "source", "<b>source</b>").str.

Answer 3

為什么不拆分並加入？

function replaceAndCount( str, toBeReplaced, toBeReplacedBy )
{
  var arr = str.split( "toBeReplaced" );

  return [ arr.join( toBeReplacedBy  ), arr.length ];
}  

replaceAndCount( "Of course, there are many other open source or commercial tools available. Twitter typeahead is probably the most important open source alternative." , "source", "<b>source</b>");

Answer 4

您可以先計算這樣的發生次數

var occurencies = (string.match(/source/g) || []).length;

然后更換它們

Answer 5

用replace不能返回2個值（被替換的字符串和被替換的計數）。

但是，您可以使用計數器並在回調函數中對其進行遞增 。

 var count = 0; // Declare the counter var res = "Of course, there are many other open source or commercial tools available.Twitter typeahead is probably the most important open source alternative.".replace(/source/g,function(m) { count++; return '<b>source</b>';}); // demo check document.getElementById("r").innerHTML = "Result: " + res; document.getElementById("r").innerHTML += "<br/>Count: " + count; 

 <div id="r"/>