toHiragana method
Converts katakana to hiragana.
カタカナをひらがなに変換します。
final text = "アイウエオ";
final converted = text.toHiragana(); // "あいうえお"
Implementation
String toHiragana() {
return replaceAllMapped(RegExp("[ァ-ヴ]"),
(Match m) => String.fromCharCode(m.group(0)!.codeUnitAt(0) - 0x60));
}