char[] hexdigits = "0123456789ABCDEF";
char[] digits = "0123456789"
char[] octdigits = "01234567"
char[] lowercase = "abcdefghijklmnopqrstuvwxyz"
char[] uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
char[] letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
char[] whitespace = " \t\v\r\n\f"
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See also:
StringException
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