ES2024 > flag v

(unicodeSets) (explainer) as an upgrade to flag u, which adds a set of multicharacter "properties of strings" to \p{…}, multicharacter elements within character classes via \p{…} and \q{…|…}, nested character classes, set operators […--…] and […&&…], and different escaping rules within character classes. It also fixes case-insensitive matching for \p and \P within negated [^…].