Form follow up URL using a form field value

Question

I am using a form to capture basic details such as name, email, website. I'd like to use the input from the website field + a predefined set of characters as a follow-up external URL.
 
For example website field is: www.example.com 
Pre-defined characters are: /123XYZ
The follow-up URL would be  example.com/123XYZ
 
As form URLs only allow text my.tokens and nested tokens are not possible to use, is there any other way I can achieve the above? 
 
P.S. I have made sure the website field only captures valid websites such as example.com or www.example.com

SanfordWhiteman · Accepted Answer

P.S. I have made sure the website field only captures valid websites such as example.com or www.example.com

Not sure what you mean by “valid” here, but if the field Website always contains a hostname and you want to swap that hostname into the Thank You URL:

MktoForms2.whenReady(function(mktoForm){
   mktoForm.onSuccess(function(submittedValues,baseThankYouURL){
      
      let thankYouLoc = document.createElement("a");
      thankYouLoc.href = baseThankYouURL;      
      thankYouLoc.hostname = submittedValues["Website"];  
      
      document.location = thankYouLoc;
      return false;
   });
});

You would set the Thank You URL in form editor to a placeholder like https://www.example.com/123456. Then at runtime the www.example.com is replaced by whatever the Website value was.

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