test = c ( "AAABBB", "CCC" )


This works :

gsub ( "[A-Z]", "2", test )



None of these do :

gsub ( "[A-Z]", [:alnum:], test )
gsub ( "[A-Z]", [[:alnum:]], test )
gsub ( "[A-Z]", "[:alnum:]", test )
gsub ( "[A-Z]", "[[:alnum:]]", test )
gsub ( "[A-Z]", "^[:alnum:]$", test )



What am I doing wrong, please ?

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