Renamer not functioning as the Vartoy predicts

[Damit]

I am trying to work with the renamer. I am including a place holder in my file names to replace with a variable.  I have tried (PS) and {PS}.  For some reason {PS} does not show in the file name in IMatch.  Nothing is displayed where the {PS} stands, so if I had {PS}-1234.jpg, in IMatch it shows up as -1234.jpg in the file name. This is very curious. So, I switched the place holder to (PS). That is not the problem, but I thought I would report this unpredictable behavior to perhaps find out why IMatch is removing the {PS}.

Whether I use {PS} or (PS) the issue I am having is the same.  In the renamer I have the first step as "Original File Name." Next I have a "Replace Text" with a variable step.  The Replace value is "(PS)" and the With value is

{File.Width|cast:int;math:div,{File.MD.JFIF::Main\3\XResolution\0|default:{File.MD.Exif::Main\282\XResolution\0}},1}" x {File.Height|cast:int;math:div,{File.MD.JFIF::Main\5\YResolution\0|default:{File.MD.Exif::Main\283\YResolution\0}},1}"

The file name is "(PS)-Ep10000xl-1500dpi-0108.tif"
The Replacement result is "3.8" x 2.9 _-Ep10000xl-1500dpi-0108.tif"
I would expect it to be "3.8" x 2.9"-Ep10000xl-15000dpi-0108.tif" for, according to the VarToy,

{File.Width|cast:int;math:div,{File.MD.JFIF::Main\3\XResolution\0|default:{File.MD.Exif::Main\282\XResolution\0}},1}" x {File.Height|cast:int;math:div,{File.MD.JFIF::Main\5\YResolution\0|default:{File.MD.Exif::Main\283\YResolution\0}},1}"

Should equal 3.8" x 2.9"

But, as you can see in my example, the Renamer is not including the inch sign (") and it adds an underscore (_).  I cannot figure out why, so I thought I would ask here. As always, any help would be greatly appreciated.

[sybersitizen]

" is an illegal character in Windows filenames. { and } can be used in most cases, but it's better to avoid them.

[Mario]

Please stick to the official Windows file naming conventions. Do not use characters illegal for file names.
See https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file

[Damit]

Ahh! Excuse my ignorance.  
I see now that the " was the problem, but if renamer is going to reject it at the end of a variable, should it not in the middle, as well? Just wondering. It would have helped me figure it out, but I am glad you both clarified so quickly, as I need to figure this out before proceeding with naming my new scans. THANK YOU!!!!!

By the way, is it possible to get a clarification on why IMatch is not displaying the {PS} in the beginning of the file name.  I checked the link Mario provided and { is not an illegal character.

Lastly, perhaps it may be a good idea to include that link or a short primer of naming conventions on the Renamer section so as to fool proof it more, because the fool still screwed it up.  Just a suggestion in case Mario thinks it may be a good idea.

[Tveloso]

By the way, is it possible to get a clarification on why IMatch is not displaying the {PS} in the beginning of the file name.

It may be that the Renamer is trying to parse that as an IMatch Variable...(and since {PS} is an unknown Variable, the result is NULL)