available classes
claSS MeMBerS
Alnum A-Z, a-z, 0-9
Alpha A-Z, a-z
Blank Space, Tab
Cntrl ASCII characters 0-31 (nonprinting control characters)
Digit 0-9
Alnum A-Z, a-z, 0-9
Alpha A-Z, a-z
Blank Space, Tab
Cntrl ASCII characters 0-31 (nonprinting control characters)
Digit 0-9
....
etc
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