# icu_pattern [](https://crates.io/crates/icu_pattern)
`icu_pattern` is a utility crate of the [`ICU4X`] project.
It includes a [`Pattern`] type which supports patterns with various storage backends.
The types are tightly coupled with the [`writeable`] crate.
## Examples
Parsing and interpolating with a single-placeholder pattern:
```rust
use icu_pattern::SinglePlaceholderPattern;
use writeable::assert_writeable_eq;
// Parse a pattern string:
let pattern = SinglePlaceholderPattern::try_from_str(
"Hello, {0}!",
Default::default(),
)
.unwrap();
// Interpolate into the pattern string:
assert_writeable_eq!(pattern.interpolate(["World"]), "Hello, World!");
```
[`ICU4X`]: ../icu/index.html
[`FromStr`]: core::str::FromStr
## More Information
For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).