diff --git a/src/operators.YAML-tmLanguage b/src/operators.YAML-tmLanguage
index 92a56bb..fd30386 100644
--- a/src/operators.YAML-tmLanguage
+++ b/src/operators.YAML-tmLanguage
@@ -35,5 +35,5 @@ repository:
                 match: '(\~)'
                 name: keyword.operator.transpose
             -
-                match: "[\\b\\)](\\')"
+                match: "(\\')"
                 name: keyword.operator.derivative
diff --git a/tests/Comments.test.gp b/tests/comments.test.gp
similarity index 100%
rename from tests/Comments.test.gp
rename to tests/comments.test.gp
diff --git a/tests/Functions.test.gp b/tests/functions.test.gp
similarity index 100%
rename from tests/Functions.test.gp
rename to tests/functions.test.gp
diff --git a/tests/Literals.test.gp b/tests/literals.test.gp
similarity index 100%
rename from tests/Literals.test.gp
rename to tests/literals.test.gp
diff --git a/tests/Operators.test.gp b/tests/operators.test.gp
similarity index 87%
rename from tests/Operators.test.gp
rename to tests/operators.test.gp
index 7696458..17be978 100644
--- a/tests/Operators.test.gp
+++ b/tests/operators.test.gp
@@ -32,5 +32,6 @@
   [1, 2, 3; 4, 5, 6]~
 ##                  ^ source.parigp keyword.operator.transpose
 
-  ('x^2 + 1)'
-##          ^ source.parigp keyword.operator.derivative
+  [('x^2 + 1)', 1; 1, 'x]'
+##           ^ source.parigp keyword.operator.derivative
+##                       ^ source.parigp keyword.operator.derivative