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  1. or download this
    while( <DATA> ) {
  chomp;
  print "( $_ ) = ( ", eval($_), " )\n";
}
  2. or download this
    use Math::Expression::Evaluator;

...
1 + 2
2 * 2 + 4
asdf#@fg
  3. or download this
    ( 1+2 ) = ( 3 )
( 1 + 2 ) = ( 3 )
( 2 * 2 + 4 ) = ( 8 )
Unable to resolve expression (asdf#@fg).