[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en-us[UAX #31: Unicode Identifier and Pattern Syntax]]
([TIME[2018-06-05 01:38:57 +09:00]])
<https://www.unicode.org/reports/tr31/#Specific_Character_Adjustments>
]FIGCAPTION]

> Katakana_Or_Hiragana \p{script=Hrkt} is empty (used historically in Unicode, but no longer.)

]FIG]