This command is part of the [TclX] pacakge.

    :   '''ctype''' ?'''-failindex''' ''var''? ''class string''

Returns whether the ''string'' is in the given ''class'', optionally setting ''var'' to the index of the first character in ''string'' that is not in the class.

The following ''class''es are supported:
    :   '''alnum''', '''alpha''', '''ascii''', '''cntrl''', '''digit''', '''graph''', '''lower''', '''space''', '''print''', '''punct''', '''upper''', '''xdigit'''

There are also '''char''' and '''ord''' special classes for conversion between characters and their unicode code points.

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