Documentation about regex backslash-doubling doesn't work as expected

[MattF-NSIDC]

• bump-my-version version: 0.9.2
• Python version: 3.10
• Operating System: Pop!_OS 22

Description

I'm trying to get my repo's CITATION.cff file to automatically update both the version string and release date.

What I Did

Based on the docs, I should be doubling both my braces and backslashes when writing a regex:

[[tool.bumpversion.files]]
filename = "CITATION.cff"
search = 'date-released: "\\d{{4}}-\\d{{2}}-\\d{{2}}"'
replace = 'date-released: "{now:%Y-%m-%d}"'

This doesn't behave as expected. In my logs:

Searching for the regex: 'date-released: "\\d{4}-\\d{2}-\\d{2}"'                                                                               
Searching for the regex: 'date-released: "\\d{4}-\\d{2}-\\d{2}"'                                                                               
Not changing file CITATION.cff                                                                                                                 

The braces were behaving as expected with Python formatting -- doubling them results in a literal brace. But the backslashes are coming through exactly as I entered them in my TOML config.

After changing to single backslashes, I get the behavior I expected:

Searching for the regex: 'date-released: "\d{4}-\d{2}-\d{2}"'                                                                                  
Changing file CITATION.cff:                                                                                                                    
*** before CITATION.cff                                                                                                                        
--- after CITATION.cff             
***************                    
*** 22,28 ****                     
  repository-code: "https://github.com/nsidc/qgreenland"               

  version: "3.0.0alpha5"           
! date-released: "2023-08-23"      

  authors:                         
  - family-names: "*Fisher"        
--- 22,28 ----                     
  repository-code: "https://github.com/nsidc/qgreenland"               

  version: "3.0.0alpha5"           
! date-released: "2023-08-14"      

  authors:                         
  - family-names: "*Fisher"        

[coordt]

I'll fix the documentation. I double-checked my tests and I don't use double backslashes there either.