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Uppercase letter
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Any of the following 26 characters
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
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Lowercase letter
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Any of the following 26 characters
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
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Letter
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Any uppercase or lowercase letter
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Decimal digit
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Any of the following 10 characters
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
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Printing character
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A character, including space (' ') that is displayed on the screen (corresponding to ASCII codes 0x20 to 0x7E)
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Control character
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Any character except a printing character
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White-space character
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Any of the following 6 characters
Space (' '), form feed ('\f'), new-line (’\n’), carriage return (’\r’), horizontal tab (’\t’), vertical tab (’\v’)
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Hexadecimal digit
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Any of the following 22 characters
’0’, ’1’, ’2’, ’3’, ’4’, ’5’, ’6’, ’7’, ’8’, ’9’,
’A’, ’B’, ’C’, ’D’, ’E’, ’F’, ’a’, ’b’, ’c’, ’d’, ’e’, ’f’
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Special character
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Any printing character except space (’ ’), a letter, or a decimal digit
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Blank character
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Either of the following 2 characters
Space (’ ’), horizontal tab (’\t’)
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