I am noticing some really strange behavior with Regex replacements and
am wondering if anyone can help me make any sense of it.

Let's say we have a string "Price=#InsertPrice#" and we want to
replace "#InsertPrice# with one or more "$" symbols to denote the
price level.

Now, here's what I'm seeing when I try the following replacement
strings:

Replacement String                                    Output
---------------------------------------------------------------------------------------
"$"                                    ->                     "Price=
$"
"$$"                                  ->                      "Price=
$"
"$$$"                                ->                      "Price=$
$"

What appears to be happening is that it's truncating the first "$"
when the output string is being built.

My first thought is that this might be because the "$" symbol is a
special character used for substitutions and I needed to escape it.
But when I try to escape it, it doesn't work either. I get:

@"\$\$"                             ->                       "Price=\$\
$"

At this point I have no idea what is going on here and all I can think
of is that this must be a bug. Any ideas?