7 releases (4 breaking)

0.5.1	Jan 17, 2026
0.5.0	Jan 17, 2026
0.4.0	Jan 7, 2026
0.3.0	Jul 14, 2023
0.1.0	Dec 29, 2021

#494 in Text processing

749 downloads per month
Used in grace-cli

BSD-2-Clause

32KB
491 lines

ReCase

Changes the input text to the desired convention case.

Install

Add this to your Cargo.toml:

[dependencies]
recase = "0.5.1"

Features

Zero Allocation Logic: Heavily optimized runtime and memory usage. It allocates exactly once (for the result string).
Unicode Aware: Handles complex graphemes, and acronyms correctly aside from emojis, they are treated the same as lowercase characters for now.
Acronyms: now support acronyms and will not split them into seperated characters anymore.

Example:

use recase::{ReCase, Casing};

fn main() {
    const INPUT: &str = "Löng and meaningless-HTML_Text";

    // Using the Casing Trait
    println!("{}", INPUT.to_kebab_case()); // Prints "löng-and-meaningless-html-text"

    let recase = ReCase::new(INPUT);

    println!("{}", recase.snake_case()); // Prints "löng_and_meaningless_html_text"
    println!("{}", recase.camel_case()); // Prints "löngAndMeaninglessHTMLText"
}

All supported convention cases:

Convention Case	Trait Method (on `&str` / `String`)	Struct Method (`ReCase`)	Example Result
camelCase	`.to_camel_case()`	`.camel_case()`	`exampleString`
snake_case	`.to_snake_case()`	`.snake_case()`	`example_string`
PascalCase	`.to_pascal_case()`	`.pascal_case()`	`ExampleString`
kebab-case	`.to_kebab_case()`	`.kebab_case()`	`example-string`
dot.case	`.to_dot_case()`	`.dot_case()`	`example.string`
path/case	`.to_path_case()`	`.path_case()`	`example/string`
windows\path\case	`.to_windows_path_case()`	`.windows_path_case()`	`example\string`
normal case	`.to_normal_case()`	`.normal_case()`	`example string`
Title Case	`.to_title_case()`	`.title_case()`	`Example String`
Sentence case	`.to_sentence_case()`	`.sentence_case()`	`Example string`
Header-Case	`.to_header_case()`	`.header_case()`	`Example-String`
UPPER_SNAKE_CASE	`.to_upper_snake_case()`	`.upper_snake_case()`	`EXAMPLE_STRING`
AlTeRnAtInG cAsE	`.to_alternating_case()`	`.alternating_case()`	`eXaMpLe StRiNg`

Limitations

Emojis are treated the same as lEmoji will be counted as lowercase characterowercase characters.
Some UTF-8 characters can't be lowercased, like "SS" which is the uppercased form of "ß" or the dotless I (I) will turn into a normal i. There might be more cases that I failed to notice.

Acknowledgements

Heavily influenced by ReCase from techniboogie-dart.

Dependencies

~1MB
~13K SLoC