Adding text to a field before save (Drupal 7) I run into a situation where I need to wrap text inputted into a field before it is saved. I'm not sure the best way to do this, seems pretty straightforward but I'd like to find the "recommended way", to pull this off. 

I have a node type called Post.
There is a field that captures ID -> field_id 
Now I want to wrap this in HTML.

For example ->
(some html) . field_id . (/some more html)

Key point is that this append needs to happend before the save, rewritting the field in Views UI happens after the fact.
you could create your own module and implement this hook:

hook_node_presave

This hook allows you to modify the node object (and corresponding fields) before it is saved or updated within the database.