Question

我有一个字符串，我想要替换特定的单词，并且还要计算出现次数。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>');

这会将所有source替换为<b>source</b>，但我想要source的出现次数，即2。

Answer 1

在替换电话之前，你可以做到：

＆＃13;

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);

＆＃13;

Answer 2

function replaceAndCount(str, tofind, rep){

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

}

像这个功能。

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;

并且新字符串将是

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

Answer 3

为什么不拆分和加入？

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

你可以先计算这样的事件

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

然后替换它们

Answer 5

无法使用replace返回2个值（替换后的字符串和替换计数）。

但是，您可以使用计数器并在回调函数 中增加它。

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"/>

替换并获取单词出现次数

5 个答案: