PII mask in GTM

gistfile1.js

/*

REMOVE EMAIL PII FROM URL

For best use: run this after scripts that need to leverage the email in the query string 
and before you start loading marketing pixels.

*/


//get url parameter from url
function getUrlParam(e) {e=e.replace(/[\[]/,"\\[").replace(/[\]]/,"\\]");var n=new RegExp("[\\?&]"+e+"=([^&#]*)"),r="";if(typeof t==="undefined"){r=n.exec(location.search)}else{r=n.exec(t)}return r==null?null:decodeURIComponent(r[1].replace(/\+/g," "))}

//you can optionally save the email address for use later in a global variable or as part of a global object if you want. 
var user_email = null;

//this checks if email is a query string
if (getUrlParam('email') !== null) {
  //get the original url decode it, save out the email address
  var original_url = window.location.href,
      decoded_url = decodeURIComponent(original_url),
      original_url_email = decoded_url.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi),
      new_url = decoded_url.replace(original_url_email[0], '[email protected]');
      
      //swap out the URL with the redacted url using replaceState to avoid page refresh
      window.history.replaceState({},"", new_url);
  
      //assign the original email to the global scope variable for use in other internal scripts
      user_email = original_url_email[0];
}