lookbehind and using it with grep in Vi?

Question

Trying to get into Vi (not Vim), after learning Vim.

1. Vim has a lookabehind like /\(Not this\)\@<!$, how to do it in Vi?
2. If I want to search recurvively down directory in Vim, I could do :vimgrep /\(Not this\)\@!$ -r *, what about Vi?
3. if (1) and (2) are not available in Vi, how do you accomplish them?

Please, create tag lookbehind and regex.

Answer 1

According to vim help (:help pattern-overview), \@i is not supported by vi.

It may be you can enumerate all the possible combinations to avoid this, or find a different expression. Alternatively I guess you could farm the job off to some external tool or interpreter like perl. I checked egrep -- it doesn't support it. What are you searching for?

Out of interest, why are you preferring vi over vim?

Answer 2

Hum... I usually end up installing the complete version of vim in $HOME, even on unix stations like Solaris stations, that only have the old vi at first.

Otherwise, grep+egrep+$(), or even perl as Edd suggested, will do the trick from the shell.