Regex will surely be your friend here. Do you want to remove from the string, replace them with new random chars, or throw out the password entirely and regenerate a new random string?

I would use character classes for each set of things you want to be track duplicates for, with something like the below.

my $password = 'a8f3%djk$'; # some random string
if ($password =~ m/[[:alpha:]]{3,}|\d{3,}|[\^@\(]{3,}/)
{
  # regenerate password
}
[download]

You could use a character class like [A-Za-z] instead of [[:alpha:]] if you know you will only see ascii character. You will likely have to add to the [\^@\(] character class any other symbols you want. The other option is to exclude anything you don't want to match in that class. Maybe [^0-9A-Za-z] is enough there.

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