Question

Ok I use method from here: How to Read only the last line of a text file in Lua?

The problem is that sometimes line can be bigger.

The question is how can i find first word “foo” from the end of file and then use everything after it?

Answer 1

The problem is that sometimes line can be bigger.

Then you just need to seek further back from the end.

The question is how can i find first word “foo” from the end of file and then use everything after it?

Grab a big enough chunk of the file to be sure you’ve got the last foo, the use .*foo to skip everything up to and including the last “foo” (.* is greedy).

local f = io.open('filename', 'r')
f:seek('end', -1024)
local text = f:read('*a')
local after = string.match(text, ".*foo(.*)")
f:close()