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Ruby - Extract Year from document text

Last Modified: 2016-03-02
Hello, I am trying to update a Ruby script that looks in html files downloaded from the IRS site and finds specific text in the file to extract the Year from the document.   The script works fine however there are not 2 types of documents that can be in the folder and the line in question is different in each document.  How can I add an "or" or "if" clause so the script looks for the text formatted either way and pulls out the year based on how the line of text reads.   The line currently in the file is displayed as "TAX PERIOD:    DEC. 31, 2014"  The line in the 2nd document that I need to add is displayed as "Tax Period or Periods:  December, 2014"  I would need the year "2014" extracted from each document.   I have attached screenshots of the script in color and the 2 document types.

#Open and read the downloaded file
	transcript_html_name = files_in_dir[i]
	File.open(Dir.pwd + "/Transcripts/#{transcript_html_name}", "r") do |f|
		f.each_line do |line|
			 #Search for the Tax Period date to get the year
			if line.include? "TAX PERIOD:" 
				line.gsub!(/(<[^>]*>)|\n|\t/s) {""}
				line.slice!("TAX PERIOD:")
				line.gsub!(/\w\w\w[.]\s\d\d[,]\s/) {""}
				year = line

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