InDesign CC GREP Help. Adding spaces around "+" (plus) symbol

Question

Should be simple but it's not.

This GREP expression works in the FIND/CHANGE PANEL in InDesign CC:

However, when I plug it into a FindChangeList.txt, it doesn't work:

I know for a fact that the list file is being called correctly and works - so it's not anything to do with that. (If I change it to TEXT and change "2+2" to "2 + 2" the script runs perfectly.)

What is going on?

Thank you!

Answer 1

My friends found the answer on this thread:

https://forums.adobe.com/thread/2207571

I needed to use double backslash in the text file.

So this works!

{findWhat:"(\\d)(\\+)(\\d)"}    
{changeTo:"$1\\s$2\\s$3"}   

Thanks to everyone who tired.

Answer 2

Try searching every \+ preceded by a number (?<=\d) and followed by a number (?=\d):

(?<=\d)\+(?=\d)

and change it for \s+\s