diff --git a/lecture_material/15-regex/regex.ipynb b/lecture_material/15-regex/regex.ipynb
index f905b454e9cff45202b6a0f259bb6b5ea584a7c8..179d60cfb31abefca54d3489eaa4f7bcdfa76628 100644
--- a/lecture_material/15-regex/regex.ipynb
+++ b/lecture_material/15-regex/regex.ipynb
@@ -5,7 +5,7 @@
    "id": "739a8ddd-f377-4d10-b47f-d1e378ce9039",
    "metadata": {},
    "source": [
-    "#### <b>Note:</b> If you read this file directly from GitLab you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
+    "#### <b>Note:</b> If you read this file directly from GitLab, you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
    ]
   },
   {
diff --git a/lecture_material/15-regex/regex_001.ipynb b/lecture_material/15-regex/regex_lec_001.ipynb
similarity index 99%
rename from lecture_material/15-regex/regex_001.ipynb
rename to lecture_material/15-regex/regex_lec_001.ipynb
index 6e5e02d6218c5233cb738e24d24f1d94c569f6cd..059b232eb4ad017f3c1abf50a39fd1b962eefdb7 100644
--- a/lecture_material/15-regex/regex_001.ipynb
+++ b/lecture_material/15-regex/regex_lec_001.ipynb
@@ -5,7 +5,7 @@
    "id": "ecbf8d03-d1b5-4b5b-9582-1531749d35c7",
    "metadata": {},
    "source": [
-    "#### <b>Note:</b> If you read this file directly from GitLab you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
+    "#### <b>Note:</b> If you read this file directly from GitLab, you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
    ]
   },
   {
diff --git a/lecture_material/15-regex/regex_002.ipynb b/lecture_material/15-regex/regex_lec_002.ipynb
similarity index 99%
rename from lecture_material/15-regex/regex_002.ipynb
rename to lecture_material/15-regex/regex_lec_002.ipynb
index c93af6d9679b9e141e7dc65d03fdaca3f97f23a9..79c406440a3525837fd28df328138846882ab640 100644
--- a/lecture_material/15-regex/regex_002.ipynb
+++ b/lecture_material/15-regex/regex_lec_002.ipynb
@@ -5,7 +5,7 @@
    "id": "6af05f1f-2bf3-48e7-b5d2-0dce465ab345",
    "metadata": {},
    "source": [
-    "#### <b>Note:</b> If you read this file directly from GitLab you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
+    "#### <b>Note:</b> If you read this file directly from GitLab, you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
    ]
   },
   {
diff --git a/lecture_material/15-regex/self_practice.ipynb b/lecture_material/15-regex/self_practice.ipynb
index 4f687075c84e026c9cfcf66856b2cf08752662a2..f3c365fe49b47bc9a7828b0c36dd6e7d9b2726cd 100644
--- a/lecture_material/15-regex/self_practice.ipynb
+++ b/lecture_material/15-regex/self_practice.ipynb
@@ -5,7 +5,7 @@
    "id": "7a9f4231-13d3-4e0c-8d06-d1bed74592ef",
    "metadata": {},
    "source": [
-    "#### <b>Note:</b> If you read this file directly from GitLab you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
+    "#### <b>Note:</b> If you read this file directly from GitLab, you may see redundant backslashes. You should open this file in JupyterLab to view the expressions properly."
    ]
   },
   {