Using a doubled  /e regex modifier is also possible and, IMHO, better because it is simpler. (The  /e modifier can be repeated any number of times for additional 'levels' of expression evaluation.) 

c:\@Work\Perl>perl -wMstrict -le
"my @SUB_REC =
   map [ qr{$_->[0]}, $_->[1] ],
   ( [ '\b(robert|bobby)\b', 'bob (not $1)' ], )
   ;
 ;;
 my $yourText = 'robert dobbs and roberto jones and bobby hope';
 print qq{'$yourText'};
 ;;
 $yourText =~ s{ $_->[0] }{ qq{qq{$_->[1]}} }xmsgee for @SUB_REC;
 print qq{'$yourText'};
"
'robert dobbs and roberto jones and bobby hope'
'bob (not robert) dobbs and roberto jones and bob (not bobby) hope'

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In reply to Re^5: Precompiling substitution regex by AnomalousMonk
in thread Precompiling substitution regex by FreakyGreenLeaky

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