javascript正则表达式将连续的＆符号替换为分号

Question

How to replace sequential ampersand symbol leaving single ampersand untouched. 如何替换连续的＆符号，使单个＆符号保持不变。 Below is the script I tried which replaces every ampersand into double semicolon. 下面是我尝试的脚本，该脚本将每个“＆”号替换为双分号。

<html>
<body>
<p id="demo">Women->Lingerie & Sleepwear->Bras&& Women->Western Wear->Shorts & Capris&& Women->Lingerie & Sleepwear->Nightwear & Nighties</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var str = document.getElementById("demo").innerHTML; 
    var res = str.replace('&amp', ";");
    document.getElementById("demo").innerHTML = res;
}
</script>
</body>
</html>

Answer 1

The simplest way would be to define a global regex (with a /g flag) that contains & 最简单的方法是定义一个包含&的全局正则表达式（带有/g标志） & twice: 两次：

str.replace(/&amp;&amp;/g, ";"); // replace exactly "&amp;&amp;" anywhere in the string with ";"

Running sample: 运行样本：

 function myFunction() { var str = document.getElementById("demo").innerHTML; var res = str.replace(/&amp;&amp;/g, ";"); document.getElementById("demo").innerHTML = res; }

 <p id="demo"> Women->Lingerie & Sleepwear->Bras&& Women->Western Wear->Shorts & Capris&& Women->Lingerie & Sleepwear->Nightwear & Nighties</p> <button onclick="myFunction()">Try it</button>

or use a {min,max} regex pattern as Alex R specified 或使用{min,max}正则表达式模式指定Alex R

Answer 2

您需要在regex语句中使用{min [，max]}修饰符：

str.replace(/(&amp;){2}/g, ";")

javascript正则表达式将连续的＆符号替换为分号

问题描述

2 个解决方案

解决方案1
4 已采纳 2016-03-12 04:41:21

解决方案2
2 2016-03-12 04:36:52

javascript正则表达式将连续的＆符号替换为分号

问题描述

2 个解决方案

解决方案1 4 已采纳 2016-03-12 04:41:21

解决方案2 2 2016-03-12 04:36:52

解决方案1
4 已采纳 2016-03-12 04:41:21

解决方案2
2 2016-03-12 04:36:52