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e    Evaluate the right side as an expression.
ee   Evaluate the right side as a string then eval the result.

  DB<135> $_='x'
 => "x"
...
  DB<139> s/x/$a.$a/ree          # -> eval "\$b\$b" not eval "\$b.\$b"

Scalar found where operator expected at (eval 106)[(eval 105)[multi_pe
+rl5db.pl:644]:2] line 1, near "$b$b" ...

  DB<140> s/x/$a.'.'.$a/ree      # -> eval "\$b.\$b"
 => "BB"
...

  DB<143> eval "\$b.'.'.\$b"     # what perldoc predicts for line 140
 => "B.B"