COMPARE('<.A.B.C>','<.A.B><.C>') -> 0
COMPARE('<.A.B.C>','<.A.B.D>') -> 3
COMPARE('ab<>cde','abcdx') -> 5
COMPARE('<.A><>','<.A>','<. >') -> 0
Applying the character concatenation for padding, character
extraction from a string, and character comparison rules.