> For the complete documentation index, see [llms.txt](https://hi-primus.gitbook.io/bumblebee/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions.md).

# String functions

- [Lower case](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/lower.md)
- [Upper case](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/upper.md)
- [Proper case](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/proper.md)
- [Remove accents](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/normalize_chars.md)
- [Remove special chars](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/remove_special_chars.md)
- [Normalize white spaces](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/normalize_spaces.md)
- [Left (substring)](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/left_string.md)
- [Right (substring)](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/right_string.md)
- [Mid (substring)](https://hi-primus.gitbook.io/bumblebee/transformations/transformation-functions/string-functions/mid_string.md)