diff -r 3020f8c76baa -r 9e7897f25e13 testing4/re_test4.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing4/re_test4.scala	Thu Nov 29 17:15:11 2018 +0000
@@ -0,0 +1,27 @@
+
+val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))
+
+//println("1")
+assert(ders("aaaaa".toList, EVIL_urban) == SEQ(SEQ(STAR(CHAR('a')),STAR(STAR(CHAR('a')))),CHAR('b')))
+//println("2")
+assert(ders(List('b'), EVIL_urban) == ONE)
+//println("3")
+assert(ders("bb".toList, EVIL_urban) == ZERO)
+//println("4")
+assert(matcher(EVIL_urban, "a" * 5 ++ "b") == true)
+//println("5")
+assert(matcher(EVIL_urban, "b") == true)
+//println("6") 
+assert(matcher(EVIL_urban, "bb") == false)
+//println("7")
+assert(matcher("abc", "abc") == true)
+//println("8")
+assert(matcher(("ab" | "a") ~ (ONE | "bc"), "abc") == true)
+//println("9")
+assert(matcher(ONE, "") == true)
+//println("10")
+assert(matcher(ZERO, "") == false)
+//println("11")
+assert(matcher(ONE | CHAR('a'), "") == true)
+//println("12")
+assert(matcher(ONE | CHAR('a'), "a") == true)