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Add the space between the //


[rmtzcx@rmtzcx02 ~]$ echo @ABC123DEF# | sed 's/[A-Za-z0-9]/ /g'
@ #

It can be done just with find.

find . -type f \( -path "*/DOC/*" -o -path "*/DOCS/*" \) -name "*.txt" -exec rename .txt .txtOld {} \;