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  1. or download this
    $ perl -E 'my $x = "Ken"; say "<p><%\$x%></p>" =~ s/<%(.*)%>/$1/er'
    <p>$x</p>
    
  2. or download this
    $ perl -E 'my $x = "Ken"; say "<p><%\$x%></p>" =~ s/<%(.*)%>/eval $1/e
    +r'
    <p>Ken</p>