# String functions

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