diff -r db4d2fcd8063 -r 046f37a262d0 progs/catastrophic.java
--- a/progs/catastrophic.java	Thu Dec 06 22:51:46 2018 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,40 +0,0 @@
-// a case of catastrophic backtracking in Java
-//
-// regexp: (a*)*b
-// strings: aa....
-
-import java.util.regex.*;
-
-public class catastrophic {
-    public static void main(String[] args) {
-
-        //we always run all the tests twice -> warmup of the JVM
-        for (int runs = 0; runs < 3; runs++) {
-            
-            Pattern pattern = Pattern.compile("(a*)*b");
-            
-            // Run from 5 to 28 characters
-            for (int length = 70000; length < 70001; length++) {
-                
-                // Build input of specified length
-                String input = "";
-                for (int i = 0; i < length; i++) { input += "a"; }
-                
-                // Measure the average duration of two calls...  
-                long start = System.nanoTime();
-                for (int i = 0; i < 2; i++) {
-                    pattern.matcher(input).find();
-                }
-                
-                System.out.println(length + " " + input + ": " 
-                       + ((System.nanoTime() - start) / 3000000000d) 
-                       + "s");
-            }
-        }
-    }
-} 
-
-
-
-// javac catastrophic.java 
-// java catastrophic