Hi, I tried it on the regex in the following code:

import re

r = re.compile(r"^[\w-\.]+@")

And there was an exception:

Error executing Lua callback: ...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/merge.lua:236: attempt to concatenate a nil value
stack traceback:
        ...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/merge.lua:236: in function 'Merge'
        .../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:56: in function 'get_informations'
        .../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:203: in function <.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:196>

The full regex I wanted to test is https://regexr.com/3e48o

CmdLine does not have: () as group, [] as class, {} as quantifiers, ?+*..

Useful for anyone who works across multiple platforms, not an expert in regex for now for suffered from the struggle
here's a list of some of the available engines: https://www.regexmagic.com/flavors.html

The ones I used the most are: Vim, Lua, Python, JS, PHP and maybe in the future Golang regex engine.

Does the plugin already support nvim's lua regex btw?

When I called the command directly I got the error below. It will be great if there is no error when a user calls it in normal mode.

Error executing Lua callback: .../share/nvim/lazy/lazy.nvim/lua/lazy/core/handler/cmd.lua:45: Vim:Error executing Lua callback: ...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/utils.lua:105: attempt to get length of a nil value
stack traceback:
	...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/utils.lua:105: in function 'get_longest'
	.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:82: in function 'create_window'
	.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:141: in function <.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:138>
	[C]: in function 'cmd'
	.../share/nvim/lazy/lazy.nvim/lua/lazy/core/handler/cmd.lua:45: in function <.../share/nvim/lazy/lazy.nvim/lua/lazy/core/handler/cmd.lua:16>

I found these 2 "bugs" when testing some regex search.

If I press / to start searching, it works. I can keep searching and inputting normal words or Regular expressions and it parses them. The problem comes when I erase the text on the searchbox and go to completely empty again. Step by step:

1. I press / to start searching (I have Noice on for UI stuff):
   

2. I type what I want to search:
   

3. But when I erase to change my current search, this happens:
   

It does allow me to write again my search prompt, but it errors out. It is not a breaking bug, but it's inconvenient to get this error when I change my mind about the search I am doing.

I also did notice that my Neovim instance (NVIM v0.10.0-dev-642+gc44d819ae) freezes when the plugin is enabled and I try to search for (, [, {, and their closing brackets. If that is a WIP feature, do let me know

• The hypersonic.lua in my Neovim config, for context:

return {
  "tomiis4/hypersonic.nvim",
  event = "CmdlineEnter",
  cmd = "Hypersonic",
  config = function()
    require("hypersonic").setup({
      -- config
    })
  end,
}

Problem

When there are some double quotes in the regex pattern being interpreted, the result is a bit confusing:

Proposed Solution

It will be great if we can customize the wrapping characters for every sub-pattern.

Personally, I will be happy if I can use a single space as the wrapping characters, i.e. I would prefer to use an invisible wrapping character.

Not sure if this should be an issue but is there an expectation that when highlighting a visual selection, the interaction should take place or is that out of scope?

To reproduce

1. first call the cmdline feature :Hypersonic gr[ae]y. This should work without an error.
2. press / and type gr[ae]y character by character. Should get the error after pressing [.

Error message

CmdlineChanged Autocommands for "*": Vim(append):Error executing lua callback: ...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/utils.lua:46: bad argument #1 to 'sub' (string expected, got table)
stack traceback:
	[C]: in function 'sub'
	...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/utils.lua:46: in function 'is_escape_char'
	...share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/merge.lua:219: in function 'Merge'
	.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:56: in function 'get_informations'
	.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:203: in function 'explain'
	.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:182: in function <.../share/nvim/lazy/Hypersonic.nvim/lua/hypersonic/init.lua:176>

Hello,
In the readme.md the images are not working