FYI, batch rename (with counters and some patterns, but not regex) and Copy as pathname (hold Option) are already Finder features.

Free

  Basic Batch Rename
  Standard ZIP Compression
  Image Format Conversion
  Path Copying Tools

Got 'em and since perl comes with the OS, this batch rename is my "go to" tool.

  $ more ren
  #!/usr/bin/env perl
  # Tom Christiansen <tchrist at convex.com>, in alt.sources, 90-12-08.
  # Modified by Fran?ois Pinard <pinard at iro.umontreal.ca>, 91-04-19.
  #
  # rename script examples from lwall:
  #       rename 's/\.orig$//' *.orig
  #       rename 'y/A-Z/a-z/ unless /^Make/' *
  #       rename '$_ .= ".bad"' *.f
  #       rename 'print "$_: "; s/foo/bar/ if <stdin> =~ /^y/i' *

  $operation = shift;
  for (@ARGV)
  {
      $previous = $_;
      eval $operation;
      die $@ if $@;
      if ($previous ne $_)
      {
          if (-f $_)
          {
              warn "$0: $_ already exists\n";
          }