Here's one approach, if you want to do it by hand.

• Slurp the file into a variable
• Grab all of the 'cat' tags and put them in an array.
  my (@cats) = ($file =~ m/(<cat.+?\/>)/ig)
• Then find the ones that have the missing attributes.
  

  foreach my $cat (@cats) {
    if ($cat !~ m/meow=.+?/i) {
      # do action here
    }
  }
  [download]

The process should work. However, if you have hundreds of tag/attribute combinations, you probably wouldn't want to hard code those combinations. Instead, you might prefer to do a subroutine and pass in the tag and attribute combo.

Hope this helps.

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