toggleCASE by kaki

(use srfi-13)(while(print(regexp-replace-all #/([a-z]+.)([a-z]*)(.?)/(read-line)(rec,m(let('m)#`",'1,(string-upcase'2),(string-downcase'3)")))))

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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