*** Input Pattern: ..AA.BB...
*** Match Pattern: ..(.)\1.(.)\2...
*** QR Regex: (?^:^..(.)\1.(.)\2...$)
barrelling
barrenness
...
tunnellers
tunnelling
*** Input Pattern: AB.BA.......
*** Match Pattern: (.)(.).\2\1.......
*** QR Regex: (?^:^(.)(.).\2\1.......$)
minimisation
monomaniacal
...
reverberates
secessionist