替换并获取单词出现次数

Question

我有一个字符串，我想替换特定的单词，也想计算出现的次数。 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>');

这将用<b>source</b>替换所有source ，但我也希望source的出现数也就是2 。

Answer 1

在进行替换调用之前，您可以简单地执行以下操作：

 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)
   };

}

类似于此功能。

现在计数将是

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;

和新的字符串将是

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

Answer 3

为什么不拆分并加入？

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

您可以先计算这样的发生次数

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

然后更换它们

Answer 5

用replace不能返回2个值（被替换的字符串和被替换的计数）。

但是，您可以使用计数器并在回调函数中对其进行递增 。

 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"/>