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  1. or download this
    s/($NOCHANGE)|$TOCHANGE/defined $1 ? $1 : $REPLACE /ge;
  2. or download this
    s/($NOCHANGE)|$TOCHANGE/$1 || $REPLACE /ge;
  3. or download this
    $text =~ s<(<maths>.*?</maths>)|&plus;>{ $1 || '&thinsp;&plus;&thinsp;
+' }ge;