How to complete with non-alphanumeric chanacters in fuzzy match

[4e554c4c]

Blink.cmp seems really cool, so I've decided to create blink-cmp-agda-symbols to unify agda input for neovim.

When writing agda we use a lot of non-alphanumeric symbols. Every completion is of the form \<foo> where <foo> is anything from ~= to a single space character. For a full list, see my collection here

The source boilerplate indicates needs special handling, so I've borrowed some code from blink-emoji.nvim for the bare minimum on how to handle this. For the implementation see: https://github.com/4e554c4c/blink-cmp-agda-symbols/blob/main/lua/blink-agda-symbols/init.lua#L118-L127

This works for strings which start with a single non-alphanumeric character and then alphanumeric.

I'm still having issues dealing with this with strings like \~~~ which—even if they match exactly—only get the final character replaced. I'm also having issues with \ which isn't matched at all; even if I add " " to get_trigger_chars.

Is there any way to figure out where the beginning of a fuzzy match lies? If \~~~ matches my fuzzy text exactly, it shouldn't be too hard to replace using it.