Read a text file at once for regex searching

[Paul via Digitalmars-d-learn]

I've been looking through our Library documentation and having 
trouble finding what I want.  **I'd like to read a text file in 
all at once** and do some searching and analytics on it instead 
of reading it bit by bit or line by line.  Do we have some such 
function in our std library?

Thanks in advance.