hanyu:

- match: (j|q|x)ü
  subst: \1u

wadegiles:

- match: pie\Z
  subst: pieh
- match: (ts|ch)`eh
  subst: \1`e
- match: ts`ih
  subst: tz`u
- match: (k|k`|h)e\Z
  subst: \1o
- match: (k|k`)ui\Z
  subst: \1uei
- match: (sh|ch)o\Z
  subst: \1e
- match: (ch|ch`|ts`|t|t`|l|n|j|s)uo
  subst: \1o
- match: tsih
  subst: tzu
- match: sih
  subst: ssu

tongyong:

- match: feng
  subst: fong

palladius:

- match: (ц|цз|с)ы([^и].{0,2})
  subst: \1\2
- match: (ц|цз|с)ыи
  subst: \1ы
- match: (ц|цз|с)и(.{1,3})
  subst: \1\2
- match: (ц|г|х|к|л|н|ж|чж|цз)уо
  subst: \1о
- match: хуй
  subst: хуэй
- match: цзюэ
  subst: цзюе