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1.28.12 Character: testing

isAlphaNumeric
True if self is a letter or a digit


isDigit
True if self is a 0-9 digit


isDigit: radix
Answer whether the receiver is a valid character in the given radix.


isLetter
True if self is an upper- or lowercase letter


isLowercase
True if self is a lowercase letter


isPathSeparator
Returns true if self is a path separator ($/ or $\ under Windows, $/ only under Unix systems including Mac OS X).


isPunctuation
Returns true if self is one of '.,:;!?'


isSeparator
Returns true if self is a space, cr, tab, nl, or newPage


isUppercase
True if self is uppercase


isVowel
Returns true if self is a, e, i, o, or u; case insensitive