The match keys that are generated depend on your configured match settings and characteristics of the data in the base object.
The following example shows match keys generated from strings using a fuzzy match / search strategy:
String in Record
Generated Match Keys
BETH O'BRIEN
MMU$?/$-
BETH O'BRIEN
PCOG$$$$
BETH O'BRIEN
VL/IEFLM
LIZ O'BRIEN
PCOG$$$$
LIZ O'BRIEN
SXOG$$$-
LIZ O'BRIEN
VL/IEFLM
In this example, the strings BETH O'BRIEN and LIZ O'BRIEN have the same match key values (PCOG$$$$). The match process would consider these to be match candidates while searching for match candidates during the match process.