Hi wolis, you have to be more specific with what you are searching for in your regular expression.

Your regular expression will look for ^bing (bing at the start), bong and bang\d\d (anywhere on the line). If you want to search for all these at the beginning of the line, you can add brackets - ( ... ) -

  m/^(?:bing|bong|bang\d\d)/
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Note that I also added '?:' in front of the patterns to tell Perl not to capture any matches for just a bit faster.