JavaScript javascript regex replace sequential ampersand symbol to semicolon javascript regex replace all,javascript regex replace group,javascript regex

How to replace sequential ampersand symbol leaving single ampersand untouched. Below is the script I tried which replaces every ampersand into double semicolon.

<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 &amp; twice:

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

Running sample:

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>
Answer:2

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