That is the precise cause of the problem in IBM's REXX code.
 

On Thu, 1 Nov 2018 15:14:24 +0000, Jeremy Nicoll 
<[email protected]> wrote:
>
>I don't recall seeing your original question... but you are aware that the
>REXX  pull statement is a short form of    parse pull upper    aren't you?
>
>That is, pull always works with an uppercase version of the input string.
>
>If you need mixed case you should use: parse pull ...
>
>--
>Jeremy Nicoll - my opinions are my own.
>

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