For a very flexible approach to renaming see the cookbook, recipe 9.9:

#!/usr/bin/perl -w
# rename - Larry's filename fixer
$op = shift or die "Usage: rename expr [files]\n";
chomp(@ARGV = <STDIN>) unless @ARGV;
for (@ARGV) {
    $was = $_;
    eval $op;
    die $@ if $@;
    rename($was,$_) unless $was eq $_;
}
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% rename 's/\.orig$//'  *.orig
% rename 'tr/A-Z/a-z/ unless /^Make/'  *
% rename '$_ .= ".bad"'  *.f
% rename 'print "$_: "; s/foo/bar/ if <STDIN> =~ /^y/i'  *
% find /tmp -name '*~' -print | rename 's/^(.+)~$/.#$1/'
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-- Hofmator