What are you trying to do with your code?
I'm just playing around.
Returning a qr// regex is a work around.
I read perlre and re, and I consider "(?{1})" a valid
return value. You can use other strings without a problem:
$ id|perl -nle 'print /( (??{ q[uid=\d+] }) )/x'
uid=1000
This snippet from perlre doesn't specify a regex ref or
string (although it is pretty vague). The example which
follows in the man page uses a recursive qr// definition
(so does return a qr// object).
From perlre:
(??{ code })
...
The result of evaluation is considered as a regular
expression and matched as if it were inserted
instead of this construct.
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