•   *    The asterisk wildcard matches zero or more charcaters.
  
•   ?    The question mark wildcard matches exactly one character.
  
•   ;    The semicolon character seperates search patterns.
  

• Keyword Search :   A search pattern that doesn't contain "*", "?" and ";".
  
• Wildcard Search :   A search pattern that contains "*", "?" or ";".
  

Pattern	Matches	Not Match	Description
happy	Enjoy a Happy Life	Enjoy Life	keyword search, search for file names contain "happy"
enjoy * life	Enjoy a Happy Life	A Happy Life	wildcard * search, search for file names that begin with "enjoy" and end with "life"
happy*	Happy Life	Enjoy a Happy Life	wildcard * search, search for file names that begin with "enjoy"
*life	Enjoy a Happy Life	Enjoy Life and Be Happy	wildcard * search, search for file names that end with "life
enjoy ? happy life	Enjoy a Happy Life	Enjoy our Happy Life	wildcard ? search
happy;	Happy	Enjoy a Happy Life	search for file names that exactly is "happy"
*life;*happy	Enjoy a Happy Life Enjoy Life and Be Happy	Enjoy a Happy Life.txt	";" separator merges results
*life;happy	Enjoy a Happy Life Happy	Enjoy Life and Be Happy	This is a wildcard search, not a keyword search . It doesn't match "AAA happy BBB" .
*life;*happy*	Enjoy a Happy Life Happy Enjoy Life and Be Happy	Enjoy Life.txt	matches "AAA happy BBB' also.
;	Nothing	Everything	single ";" means search for nothing (this could help you release memory)