Re: Search for character that doesn't have a combining character?

On Tuesday, June 23, 2015 at 3:35:50 PM UTC-5, Ben Fritz wrote:
> I'm working on a custom command to add strikethrough to text, using the Unicode COMBINING LONG STROKE OVERLAY, 0x0336.
>
> In this command, I want to apply a strikethrough to a character, only if it is not already present.
>
> This pattern fails because it doesn't match *anything* with regexpengine set to 2, it does not match an unadorned character immediately before a struck-through base character, and it *does* match the last combining character in a word for some reason:
>
> [^\u0336]\%u0336\@!
>
> This pattern also fails, because it matches already struck-through base characters for some reason (although it does the same thing in both engines):
>
> [^\u0336][^\u0336]\@=
>
> What is the correct way to do this?
>
> Full command (attempted):
>
> '<,'>s;\%#=1\%V[^\u0336]\%u0336\@!;\=submatch(0)."\u0336";g
>
> Note, how I'm also limiting to a visual selection; so I'm trying to use the :s command for simplicity.

My next attempt is to do two passes, first to remove the combining character from everywhere in the visual selection, and then to add it to the entire visual selection.

But, my patterns for this task either don't match at all, or they remove the base character along with the combining character! Even this doesn't work, it removes the base character:

echo join(split(getline('.'), "\u0336"),"")

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