package ShownameFilter;
use Filter::Simple;

FILTER_ONLY code => sub {
    s{
    showname\(
      (                # Capture 2 (closes second)
          \s*
          \\?          # References
          [\$@%*]+     # Scalar, array, hash, glob
          (            # Capture 1 (closes first)
           \w*         # alphanumeric. Doesn't catch a lot of perl special vars
          )            # End capture 1
          \s*
      )                # End capture 2
      \)
    }
    {showname('$2',$1)}xg;
};

1;