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The perl-way:

#!/usr/bin/perl

opendir(DIR,".") or die "$@:$!";
while ($in = readdir(DIR)) {
  next unless -f $in;
  ($out = $in) =~ s/[^a-zA-Z0-9._-]//g;
  warn "$@:$!" unless rename $in, $out;
}
closedir(DIR);

The regex filters onle a-zA-Z ... as valid chars, there is no checking for empty target names.