ppkarwasz commented on issue #2679:
URL:
https://github.com/apache/logging-log4j2/issues/2679#issuecomment-2217263541
After discussing in with @vy on Slack, I believe we should coherently use
`$` as escape character, with the following rules:
1. The escape character `$` only applies to the `$`, `:`, `-` and `}`
characters.
2. An escaped character loses its special meaning. So:
- `$${...}` is not expanded,
- `${sys$:-foo}` and `${sys:$-foo}` are replaced with the value of the
system property `-foo`,
- `${foo:-$}}` is expanded as `}` if `foo` is not defined.
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