Is there a way to modify a user response? Specifically search and replace.

What I specifically need to do is take an email in the form of john.doe+test@123.org that is given as a form response and replace the + with {plusSign} for a URL redirect to an outside address. As of now, I have to get my form user to type the code in but this is hard to explain verses just having them put in a + sign. But when we use the URL in the conditions the + is interpreted as space. 

The only issue I ran in to when testing this is that conditions interpret {plusSign} as a form field ID.  Since it is not an existing form field, it would not update properly in the form.  It would work with (plusSign) but due to the way field ID's function in conditions {plusSign} would not.  Due to that, I do not believe replacing john.doe+test@123.org with john.doe{plusSign}test@123.org would be possible.