Reactive fill and Automation (or Auto-populating)

Hello,

I've been trying to create some form of scripts, or messages templates for people to use. 

What we're trying to do, is that people could paste their own recruiting links - and when they do so, it will automatically embed them in the scripts we offer. 

If possible would be even greater, that after they input their links and press a button, all the scripts would be revealed or shown right under the button, with the link they inserted already embedded in the scripts. 

Is it possible, if so, how? I've been going through the web for days and got not solution