So, I guess you want something like this?:
^C^D^V^V^A^B{T}
That would be removal of plain "printable" text before {T}.
{T} would be the removal of all the text until {T}, which is of course just {T}. ^C,^V, etc are text characters.

Your question is nonsense in the context of a "text file".
I suspect that you are looking at a binary file instead of a text file.