Oh, hey. I didn't find that earlier because it seems to be misfiled under the (?(condition)yes-pattern|no-pattern) section but it goes on to answer my original question

From perlre:

/(?<NAME>(?&NAME_PAT))
 (?(DEFINE)
   (?<NAME_PAT>....)
 )/x

[download]

Note that capture buffers matched inside of recursion are not accessible after the recursion returns, so the extra layer of capturing buffers is necessary. Thus $+{NAME_PAT} would not be defined even though $+{NAME} would be.

In reply to Re^8: Regexp not capturing in named subrules by diotalevi
in thread Regexp not capturing in named subrules by diotalevi

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