[python-win32] How can I edit a string inside a textbox

[Alex Garipidis]

Hello everybody,
 
I have a Tkinter Textbox in my application. I want to scan the textbox for a symbol, defined by me as a "mark", and change the word that is inside or next to that symbol.
 
This is what i mean:
 
If a user types this to the textbox:
 
"Hello @everybody, how are you doing?"
 
I want to scan this string for the "@" character (or something else) and edit the word next to it (or "inside" it, e.g. "@everybody@"), "everybody" in this case, and make it have a color for example or make it underlined. 
 
I suspect that the answer is in the tag methods of Textbox but so far I haven't found an answer yet. Maybe I'm looking in the wrong direction :)
 
Thank you all
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