I was able to fix this bug, but I don't know why it was a bug.
I am finding all the ColdFusion custom tags in my site, and they are formatted like <cf_capitalize> or <cf_confirmbutton Tabindex=98 name="Next">. My regex is returning the stuff after '<cf_' and before any whitespace or '>'. Then I need to append '.cfm' to the returned string. My code below was causing weird things to happen in the hash. It was creating 2 hash keys for this value, and they looked like this:
capitalize
capitalize.cfm1
while ($_ =~ /(<cf_)(.*?)[>\s]/gi) {
  # finding custom tags
  $uniques{"$2.cfm"}++;
  $uniques{$2} = "<cust>";
}

[download]
I was able to fix it by removing the .cfm in the above code, like so: 
while ($_ =~ /(<cf_)(.*?)[>\s]/gi) {
  # finding custom tags
  $uniques{"$2"}++;
  $uniques{$2} = "<cust>";
}

[download]
Then later I append the '.cfm'. Any ideas as to why this was happening to me?

In reply to Two hash keys created when '.' is in the string by yacoubean

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