diff --git a/__test__/satysrc/generic.saty b/__test__/satysrc/generic.saty
index 5e44b62..7cc6809 100644
--- a/__test__/satysrc/generic.saty
+++ b/__test__/satysrc/generic.saty
@@ -52,49 +52,6 @@ let print-result r =
 let char-a = char (Char.make `a`) in
 let char-b = char (Char.make `b`) in
 let char-c = char (Char.make `c`) in
-% (a+)(b+)
-let () = test (seq (group (many1 char-a)) (group (many1 char-b))) `aabbb` |> String.of-bool |> Debug.log in % true
-let () = `aabbb` |> test (alt char-a char-b) |> String.of-bool |> Debug.log in % true
-% (a+|(c))(b+)
-let re1 = seq (group (alt (many1 char-a) (group char-c))) (group (many1 char-b)) in
-let ss = exec re1 `aabbb` |> print-result in
-let re3 = many (many char-a) in
-let () = `aaaaa` |> test re3 |> String.of-bool |> Debug.log in
-let re4 = seq (group (seq any (char (Char.make `e`)))) eof in
-let () = `the apple` |> exec re4 |> print-result in
-let re6 = sequence [bol; string `apple`; eol] in
-let () = `the apple
-apple
-leapple` |> exec re6 |> print-result in
-let () = exec spaces #`  asdf`# |> print-result in
-let () = `aaabb` |> test (RegExp.of-string `(a+|(c))(b+)`) |> String.of-bool |> Debug.log in
-let _ = RegExp.of-string `^\s\d$` in
-% let _ = RegExp.of-string `[]` in
-let _ = RegExp.of-string `[a-z]` in
-let _ = `0X` |> test (RegExp.of-string `0[xX]`) |> String.of-bool |> Debug.log in
-let _ = `0x1f2e3d` |> test (RegExp.of-string `0[xX][A-Fa-f0-9]+`) |> String.of-bool |> Debug.log in
-let _ = `0a` |> test (RegExp.of-string `0[xX]`) |> String.of-bool |> Debug.log in
-let _ = `0xaZb` |> test (RegExp.of-string `^0[xX][A-Fa-f0-9]+$`) |> String.of-bool |> Debug.log in
-let _ = `][][` |> test (RegExp.of-string `[][]+`) |> String.of-bool |> Debug.log in
-let _ = `][]-[` |> test (RegExp.of-string `[][-]+`) |> String.of-bool |> Debug.log in
-let input = ` I do not know why but it seems code2 is slow if it contains a long line.
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo
-wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo` in
-let pat = `wk` in
-let () = Debug.print `testing long input` in
-let () = Debug.print (String.of-bool (RegExp.test (RegExp.of-string pat) input)) in
 
 let () = Debug.log `==== Parser ====` in
 let () =
@@ -142,6 +99,7 @@ let rules = [
 let (Some tokens) = Lexer.lex rules `abc defg   hijklMNL op123 ` in
 let () = tokens |> List.iter (fun tk -> (Debug.log (`(| kind = `# ^ tk#kind ^ `, data = "`# ^ tk#data ^ `" |)`))) in
 
+
 let () = Debug.log `==== Map ====` in
 let m = Map.of-list [(1, `a`); (2, `b`); (3, `c`)] in
 let option-force (Some v) = v in
diff --git a/test/regex.test.satyg b/test/regex.test.satyg
index 1463ac6..42f56dc 100644
--- a/test/regex.test.satyg
+++ b/test/regex.test.satyg
@@ -15,10 +15,12 @@ let regex-test-cases = open Test in
     % let () = exec (compile (seq (many1 char-a) (many1 char-b))) `aabbb` |> String.of-bool |> Debug.log in
     % let () = exec re-example1 `aabbb` |> String.of-bool |> Debug.log in
     it `test "(a+)(b+)"` (fun () -> (
-      let re1 = (seq (group (many1 char-a)) (group (many1 char-b))) in
-      let re2 = (alt char-a char-b) in
-      test re1 `aabbb`
-      && test re2 `aabbb`
+      test (seq (group (many1 char-a)) (group (many1 char-b))) `aabbb`
+      |> Expect.is-true
+    ));
+    % TODO GH-142: Is this right description?
+    it `test "a|b"` (fun () -> (
+      test (alt char-a char-b) `aabbb`
       |> Expect.is-true
     ));
     it `exec "(a+|(c))(b+)"` (fun () -> (
@@ -33,8 +35,7 @@ let regex-test-cases = open Test in
     ));
     % TODO GH-142: Is this right description?
     it `test "a**"` (fun () -> (
-      let re = many (many char-a) in
-      test re `aaaaa`
+      test (many (many char-a)) `aaaaa`
       |> Expect.is-true
     ));
     % TODO GH-142: Is this right description?
@@ -65,12 +66,19 @@ leapple` in
       `aaabb` |> test (RegExp.of-string `(a+|(c))(b+)`)
       |> Expect.is-true
     ));
-    % let _ = RegExp.of-string `^\s\d$` in TODO GH-142: What do we wanna test?
-    % % let _ = RegExp.of-string `[]` in TODO GH-142: Do we wanna keep this?
-    % let _ = RegExp.of-string `[a-z]` in TODO GH-142: What do we wanna test?
+    it `compile "^\s\d" successfully` (fun () -> (
+      let _ = RegExp.of-string `^\s\d$` in
+      Expect.always-pass
+    ));
+    % fails to compile "[]"
+    it `compile "[a-z]" successfully` (fun () -> (
+      let _ = RegExp.of-string `[a-z]` in
+      Expect.always-pass
+    ));
     it `match prefix of header of hexadecimal literal` (fun () -> (
       let re = (RegExp.of-string `0[xX]`) in
       test re `0x`
+      && test re `0X`
       && not test re `0a`
       |> Expect.is-true
     ));
@@ -90,7 +98,7 @@ leapple` in
       |> test (RegExp.of-string `[][-]+`)
       |> Expect.is-true
     ));
-    it `test against long input` (fun () -> (
+    it `failing test with long input won't take that long` (fun () -> (
       % NOTE GH-142: Do we want to set timelimit?
       let input = ` I do not know why but it seems code2 is slow if it contains a long line.
 wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo wakegawakaranaiyo