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Regular expressions using character classes

Function call                                         Result   preg_match("/[Ff]oo/", "Foo")                         True   preg_match("/[^Ff]oo/", "Foo")                        False;    preg_match("/[A-Z][0-9]/", "K9")                      True   preg_match("/[A-S]esting/", "Testing")                False;    preg_match("/[A-T]esting/", "Testing")                True;    preg_match("/[a-z]esting[0-9][0-9]/", "TestingAA")    False   preg_match("/[a-z]esting[0-9][0-9]/", "testing99")    True   preg_match("/[a-z]esting[0-9][0-9]/", "Testing99")    False; case sensitivity!   preg_match("/[a-z]esting[0-9][0-9]/i", "Testing99")   True; case problems fixed with /i   preg_match("/[^a-z]esting/", "Testing")               True;    preg_match("/[^a-z]esting/i", "Testing")              False;