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helix/book/src/surround.md

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## Surround
Helix includes built-in functionality similar to [vim-surround](https://github.com/tpope/vim-surround).
The keymappings have been inspired from [vim-sandwich](https://github.com/machakann/vim-sandwich):
![Surround demo](https://user-images.githubusercontent.com/23398472/122865801-97073180-d344-11eb-8142-8f43809982c6.gif)
| Key Sequence | Action |
| --------------------------------- | --------------------------------------- |
| `ms<char>` (after selecting text) | Add surround characters to selection |
| `mr<char_to_replace><new_char>` | Replace the closest surround characters |
| `md<char_to_delete>` | Delete the closest surround characters |
You can use counts to act on outer pairs.
Surround can also act on multiple selections. For example, to change every occurrence of `(use)` to `[use]`:
1. `%` to select the whole file
2. `s` to split the selections on a search term
3. Input `use` and hit Enter
4. `mr([` to replace the parentheses with square brackets
Multiple characters are currently not supported, but planned for future release.