I'm not sure why you've included <cr> in both sides of your ternary expression: I think perhaps you've got some confusion about when you need <cr> in a mapping
Oh. Disregard what I wrote about CTRL-V. My apologies! Didn't realise there was a digraph for Ctrl-M
In fact, disregard everything I wrote above apart from my suggested mapping.
Although I think you probably actually want this mapping: nnoremap <expr> ,, strlen(getline("$"))==0 ? 'G' : 'GA<CR><Esc>'
Which leaves you in normal mode regardless of whether you had anything on your last line to start with.
You don't need to faff about with entering literal Enter characters via CTRL-K because the evaluated expression is used as the right-hand side of the mapping, and so the <CR> and <Esc> are interpreted as in :help :map-special-chars
By :set hl, the search result of a / expression is highlighted, for example:
And if one wants to replace one substring distinguished by its surrounding, one can do so elegantly using regex capture groups:
However, the search highlight does not reflect this capture group. Sometimes, it would...
Got a fun little riddle for all you vimmers: Starting from normal mode, insert the exact text Hello world! into your buffer. The twist is that no keystroke may be repeated. Fewest keystrokes wins
(Modifiers like ctrl-alt-shift are OK. "a" and "A" are two different keystrokes)
By :set hl, the search result of a / expression is highlighted, for example:
And if one wants to replace one substring distinguished by its surrounding, one can do so elegantly using regex capture groups:
However, the search highlight does not reflect this capture group. Sometimes, it would...
