用于删除紧跟在非数字之后的零的正则表达式

时间:2015-04-02 07:49:40

标签: javascript regex replace

我正在编写代码,将数千个数字(以3个块的形式分开)转换为myriads(以4个块的形式分开)以进行日语格式化。

当前代码产生以下结果:
EX)
输入:123,456,789,123,456
输出:123兆4567億8912万3456

使用正则表达式,我能够删除四个0的序列,并使用myriad = myriad.replace(/0000\D/g, "");删除程序字符。 结果:
输入:12,300,002,345
输出:123億23450000万已删除)

然而,该代码目前并没有删除不必要的零码:
EX)
输入:32,131,200,232,132
输出:32兆1312億0023万2132

(我想在23万

之前删除两个零

我正在尝试找到一个正则表达式的解决方案并试图用myriad = myriad.replace(/?=0{1,3}/g, "");无效...我很难过,任何建议都会有所帮助

编辑: 我认为正则表达式应该替换跟随任何\ D的0,但我无法弄清楚如何删除它们而不删除前面的字符

编辑:工作应用:



<!DOCTYPE html>

<html>
  <head>
   <title>変換天才</title>
   

	<script>
	

	//myriad converter function help from Stack Overflow user paxdiablo
	function makeNum(num) {
   	num = num.replace(/,/g,"");  		  //remove commas
   	var markers = "万億兆京該秭穣溝澗正載極";
   	var result = "";

	//regroup in myriads
   	while (num.length > 4) {
        if (markers.length == 0) {
            result = "(?)" + num.substr(num.length-4) + result;
        } else {
            result = markers.substr(0, 1) + num.substr(num.length-4) + result;
            markers = markers.substr(1);
        }
        num = num.substr(0, num.length-4);
  	}
   	 return num + result;
	}

	//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
	// insert commas for readability
	//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
	function makeCom(num){

	  num = num.replace(/,/g, "");
	
	  var result = num.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");

	  return result;

	}

	function convert(){
	
	var innum = document.getElementById("input").value;
	var parsnum = (innum.replace(/,/g,""));
	if (isNaN(parseInt(parsnum)) == true) {
	document.getElementById("converted").innerHTML = "Please enter valid number.";

	}
	else {
	var myriad = makeNum(innum);

	// delete unnec. zeros 
	myriad = myriad.replace(/0000\D/g, "");
	myriad = myriad.replace(/(\D)0+/g, "$1");
	document.getElementById("converted").innerHTML = myriad ;
	
	//display number with commas
	var commanum = makeCom(innum);
	document.getElementById("commaed").innerHTML = "You entered: " + commanum ;
	
	  }
	}

	
	
	//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
	// button functions
	//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
	
	function multiplier(kake) {
	 var mult = document.getElementById("input").value;
	
	  if (mult == "") {
	   mult = kake;
		}

	  else if (isNaN(mult)==false){
	   mult = (mult * kake);
		}

	  else {
	   document.getElementById("converted").innerHTML = "Please enter valid number";
	   return;
		}

	  document.getElementById("input").value = mult; 
	}


	function thou(){
	 multiplier(1000);

	 }

	function xMil(){
	 multiplier(1000000);
	}
	function xBil(){
	 multiplier(1000000000);
	}

	function xTril(){
	 multiplier(1000000000000);
	}

	function xQuad(){
	 multiplier(1000000000000000);
	} 	

	function clr(){
	document.getElementById("input").value = "";
	document.getElementById("converted").innerHTML = "";
	}

	
	</script>

  </head>

  <body>
	<div><p>Enter a large whole number (commas OK). </p></div>
	<input type="text" id="input"/>
	<input type="submit" id="submit" value="Convert" onclick="convert()">
	<br>
	<input type="button" id="xthou" onclick="thou()" value="thousand">
	<input type="button" id="xmil" onclick="xMil()" value="million">
	<input type="button" id="xbil" onclick="xBil()" value="billion">
	<br>
	<input type="button" id="xtril" onclick="xTril()" value="trillion">
	<input type="button" id="xquad" onclick="xQuad()" value="quadrillion">
	<input type="button" id="clr" onclick="clr()" value="Clr"> 
	<br><br>
	<div><span id="commaed"></span></div>
	<br>
	<div id="converted"></div>



  </body>

</html>
&#13;
&#13;
&#13;

3 个答案:

答案 0 :(得分:3)

您需要使用捕获组。

string.replace(/(\D)0+/g, "$1")

(\D)捕获非数字字符,以下0+将匹配一个或多个0。将匹配的字符替换为组索引1中存在的字符将为您提供所需的输出。

答案 1 :(得分:0)

我发现正则表达式小提琴对这种事情非常有帮助。我在这里做了一个: https://regex101.com/r/jG3aB5/1

我认为解决问题的正则表达式是这样的:

(?:[^0-9])*(0*)

它匹配单个非数字字符后面的任意数量的零。不会捕获非数字字符,也不会被替换。

答案 2 :(得分:0)

另一种方法:使用lookbehind不包含匹配字符\D但仅匹配零。请参阅正常工作DEMO

/(?!\D)0+/g

在你的情况下:

myriad = myriad.replace(/(?!\D)0+/g, "");