Fix regex that excludes files from the formatting (#2837)

* Test formatting fix

* Revert "Test formatting fix"

This reverts commit b79fae6fcf.

* Test formatting fix

* Tentative formatting fix

.repoconfig

@@ -27,7 +27,7 @@ path=<<EOT
 # general rule
 ^[:a-z0-9./_-]+$        # technically ':' not allowed, but let the global rule in format.ini do the more thorough test for c: style abs paths
 # exceptions
-|^com\.unity\.[^\/]*\/\w+~\/                                # allows editor excluded folders, like Documentation~, for core package
+|^com\.unity\.[^\/]*\/\w+~\/[^&]+$                          # allows editor excluded folders, like Documentation~, for core package
 |^com\.unity\.[^\/]*\/Packages\/com\.unity\.[^\/]*\/\w+~\/  # as above but for embedded packages
 |^com\.unity\.[^\/]*\/[^@]+@\d+x\.                          # industry standard for icons with differnet resolution
 EOT