# utf8（ロブロックス ライブラリ）

> This library provides basic support for UTF-8 encoding.

- URL：https://roblox.minecraft-okinawa.com/reference/libraries/utf8/
- 公式：https://create.roblox.com/docs/reference/engine/libraries/utf8

## プロパティ

- `utf8.charpattern: string`：The pattern "[%z\x01-\x7F\xC2-\xF4][\x80-\xBF]*", which matches exactly zero or more UTF-8 byte sequences, assuming that the subject is a valid UTF-8 string.

## 関数

- `utf8.char(codepoints: Tuple<int>): string`：Converts zero or more codepoints to UTF-8 byte sequences.
- `utf8.codes(str: string): function, string, int`：Returns an iterator function that iterates over all codepoints in a given string.
- `utf8.codepoint(str: string, i: int, j: int): Tuple<int>`：Returns the codepoints (as integers) from all codepoints in a given string.
- `utf8.len(s: string, i: int, j: int): int`：Returns the number of UTF-8 codepoints in a given string.
- `utf8.offset(s: string, n: int, i: int): int?`：Returns the position (in bytes) where the encoding of the n‑th codepoint of s (counting from byte position i) starts.
- `utf8.graphemes(str: string, i: number, j: number): function`：Returns an iterator function that iterates over the grapheme clusters of a given string.
- `utf8.nfcnormalize(str: string): string`：Converts the input string to Normal Form C.
- `utf8.nfdnormalize(str: string): string`：Converts the input string to Normal Form D.

英語の説明とメンバー一覧：Roblox Creator Documentation（CC BY 4.0）。日本語の解説はこのサイト独自のものです。

執筆：鈴木孝昌（現役プロジェクトマネージャー／プログラミング講師）／運営：沖縄マイクラ部 プログラミングスクール「クロスウェーブ」（https://minecraft-okinawa.com/）