Bug: incorrect Swift 5.7+ syntax highlighting related to extended regex literals

[marc-medley]

Description

BUG: The CotEditor swift syntax highlighting is not correct for extended regex literal syntax. The issue is easy to see with the quotation character(s) inside the /# #/ regex literal syntax. However, this may be more an issue with the #/…/# swift regex syntax in general.

To Reproduce

1. Create a swift file which includes extended regex literal which include a quotation character as part of the #/…/# Swift extended regex literal pattern. For example:

   s0 = s0.replacing(#/\n([a-zA-Z*"'–])/#) { m in
       return "    \(m.1)" // indent body below heading link
   }
   
   // Main:
   if logit.logLevel == .debug {
       writeCheckpoint(s1, base: urlBase, ext: "4a_part.md")
   }

2. Observe the resulting syntax highlighting.

Expected behavior

CotEditor highlighting was not expected:

Xcode highlighted as expected. The same section of code is highlighted in Xcode correctly as shown below:

CotEditor version

5.0.8 (692)

macOS version

15.2

Additional context

No response