diff -r 923b946347e6 -r e66bd5c563eb progs/catastrophic.rb
--- a/progs/catastrophic.rb	Mon Jul 27 01:55:05 2020 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,35 +0,0 @@
-# A case of catastrophic backtracking in Ruby
-#---------------------------------------------
-# example provided by Daniel Baldwin
-#
-# 
-# regex: (a?){n} a{n}
-# strings: aa...
-#
-# run on the command line with:
-#
-# $>  ruby catastrophic.rb
-#
-
-nums = (1..1000)
-
-#iterate through the nums 1-1000
-nums.each do |i|
-
-	start_time = Time.now
-	string = "a" * i
-
-        #create a new regular expression based on current value of i
-	re_str = "a?" * i + "+" + "a" * i
-	re = Regexp.new(re_str)
-
-        re.match(string)
-
-        #if re.match(string)
-	#	puts "matched string  a * #{i} with regex #{re}"
-	#else
-	#	puts "unmatched string a * #{i} with regex #{re}"
-	#end
-	
-  puts "#{i} %.5f" % (Time.now - start_time)
-end