Is There a Way to Grab a Number From HTML Code Into a Variable?

Questions & Suggestions
2

This is a fairly complex requirement, since the data you want is inside of a script in the web page. So we need to use both querySelectior and RegEx in a Execute a JavaScript in Front Browser action:

// --- Get Script Block That Contains the "mpn" Data ---
var scriptElem = document.querySelector('script[type="application/ld+json"]');
var mpnStr;

if (scriptElem) {
  var scriptStr = scriptElem.innerText;
  
  //--- Extract the Value of mpn Using RegEx ---
  var matchArr	= scriptStr.match(/"mpn": "(\d+)/i);
    if (matchArr) {
      mpnStr	= matchArr[1];
    } else { mpnStr = "[ERROR] Match for 'mpn' NOT Found"; }
	
} else { mpnStr = "[ERROR] Script Element NOT Found.";}

mpnStr;

Let us know if this works for you.

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