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Showing content from http://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Intl/Segmenter/segment below:

Intl.Segmenter.prototype.segment() - JavaScript | MDN

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Intl.Segmenter.prototype.segment() メソッドは、この Intl.Segmenter オブジェクトのロケールおよび粒度に従って文字列を分割します。

const string1 = "Que ma joie demeure";

const segmenterFrGrapheme = new Intl.Segmenter("fr", {
  granularity: "grapheme",
});
const graphemeSegments = segmenterFrGrapheme.segment(string1);

console.log(Array.from(graphemeSegments)[0]);
// Expected output:
// Object {segment: 'Q', index: 0, input: 'Que ma joie demeure'}

input

分割するテキストを String で指定します。

入力文字列のセグメントを含む、反復可能な新しい Segments オブジェクトです。

// ロケール固有の単語分割器を生成する
const segmenter = new Intl.Segmenter("fr", { granularity: "word" });

// それを用い、文字列のセグメントを走査するイテレーターを取得する
const input = "Moi ? N'est-ce pas ?";
const segments = segmenter.segment(input);

// それを用い、分割を行う
for (const { segment, index, isWordLike } of segments) {
  console.log(
    "segment at code units [%d, %d]: «%s»%s",
    index,
    index + segment.length,
    segment,
    isWordLike ? " (word-like)" : "",
  );
}
// logs
// segment at code units [0, 3]: «Moi» (word-like)
// segment at code units [3, 4]: « »
// segment at code units [4, 5]: «?»
// segment at code units [5, 6]: « »
// segment at code units [6, 11]: «N'est» (word-like)
// segment at code units [11, 12]: «-»
// segment at code units [12, 14]: «ce» (word-like)
// segment at code units [14, 15]: « »
// segment at code units [15, 18]: «pas» (word-like)
// segment at code units [18, 19]: « »
// segment at code units [19, 20]: «?»

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