Find: CD [space] [number], e.g. “CD 1”

^CD\s+\d+\Z

string start
CD
whitespace
digit
string end
+ 1 or more

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Total Commander Multi Rename Tool: Replace Blank Space

Search for: `\s`
Replace with: `-`
Check `RegEx`

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IMSID427B90A67843DE5B9788683BFD23B9589B918A24