The original text did not explicitly mention that regular $foo interpolation does not work here, but it seemed implied so I've added some words.
I've also added a guess at some words to try to clarify what to do with \x-style escapes. I think people would get upset if they couldn't at least have \n for a linefeed, so by extension I suspect any of the escapes that just stand in for some other literal character would be fine. The only problem ones are the case/quotmeta ones, so I've explicitly disallowed those.
The original text did not explicitly mention that regular
$foointerpolation does not work here, but it seemed implied so I've added some words.I've also added a guess at some words to try to clarify what to do with
\x-style escapes. I think people would get upset if they couldn't at least have\nfor a linefeed, so by extension I suspect any of the escapes that just stand in for some other literal character would be fine. The only problem ones are the case/quotmeta ones, so I've explicitly disallowed those.