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