Efficient file search and extract

[Sativa via Digitalmars-d-learn]

Is there a very easy way to search a file for a string, then 
extract to a new file everything from that match on to the end of 
the file?

I basically want to remove a header from a file(it's length is 
not fixed though).

It seems I'm having to convert bytes to chars to strings and back 
and all that mess, which is not very elegant.