BTW, stderr is caught as well.
No, it's not: 
perl -E '$r = `perl -E"warn qq[Hello]; print qq[world]"`; say "!$r!"'
Hello at -e line 1.
!world!
$

[download]
As you can see, STDERR of the called process is *NOT* caught, only its STDOUT.

In reply to Re^2: Regular Expression and backquoted cmds by JavaFan
in thread Regular Expression and backquoted cmds by joec_

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