How to replace value in noscript (wordpress)?

I need to replace value in noscript.
I tried the following code but it doesn't replaces the value.
Would you please let me know how to fix the code?

I tried:

jQuery("ls-slot-shortcode_actions a noscript").replaceWith("width=42");

Existing Code:

<li class="ls-slot-shortcode_actions">
     <a href="https://www.myhome.com">
          <img scr="https://www.myhome.com/img/cco.png">
          <noscript>
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"
          </noscript>
     </a>
</li>

Thank you.

Solution

this code does the job:

let selector = $(".ls-slot-shortcode_actions a noscript");
let txt = selector.text();

console.log("before modification:" + txt)

let newtxt = txt.replace(/width=".*?"/, 'width="42"');
selector.text(newtxt);

console.log("after modification:" + selector.text())

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<li class="ls-slot-shortcode_actions">
  <a href="https://www.myhome.com">
    <img scr="https://www.myhome.com/img/cco.png">
    <noscript>
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"
          </noscript>
  </a>
</li>

I you have more lines, and you want to keep just one, you could do that:

let selector = $(".ls-slot-shortcode_actions a noscript");
let txt = selector.text();

console.log("before modification:" + txt)

let newtxt = txt.replace(/width=".*?"/g, 'width="xx"');
newtxt = newtxt.replace(/width="xx"/, 'width="42"');
newtxt = newtxt.replace(/"<img width=.xx. .+>"/g, "");
selector.text(newtxt);

console.log("after modification:" + selector.text())

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<li class="ls-slot-shortcode_actions">
  <a href="https://www.myhome.com">
    <img scr="https://www.myhome.com/img/cco.png">
    <noscript>
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"
             "<img width="18" height="12" class="ls-flag" src="https://www.myhome.com/img/cco.png" >"             
          </noscript>
  </a>
</li>