If you want the dot to match anything including newlines, use the /s modifier. To evaluate the replacement as code, use the /e modifier. 
use Syntax::Construct qr{ /r };
$string =~ s:/ \* (.*?) \*/ : $1 =~ s/[^\n]//gr :gsex;

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In older Perls without /r : 

$string =~ s:/ \* (.*?) \*/ : (my $x = $1) =~ s/[^\n]//g; $x :gsex;

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re: nested replace by choroba
in thread nested replace by Anonymous Monk

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