diff --git a/lecture_material/15-regex/regex.ipynb b/lecture_material/15-regex/regex.ipynb
index 34105575ab8e8e2c41b106e14432b20ec24d21df..f905b454e9cff45202b6a0f259bb6b5ea584a7c8 100644
--- a/lecture_material/15-regex/regex.ipynb
+++ b/lecture_material/15-regex/regex.ipynb
@@ -1,5 +1,13 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "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."
+   ]
+  },
   {
    "attachments": {
     "Stephen_Cole_Kleene.png": {
diff --git a/lecture_material/15-regex/regex_lec_001.ipynb b/lecture_material/15-regex/regex_001.ipynb
similarity index 99%
rename from lecture_material/15-regex/regex_lec_001.ipynb
rename to lecture_material/15-regex/regex_001.ipynb
index 594a3f8867eaf377d4c5e23bf1fd2a19528d420e..6e5e02d6218c5233cb738e24d24f1d94c569f6cd 100644
--- a/lecture_material/15-regex/regex_lec_001.ipynb
+++ b/lecture_material/15-regex/regex_001.ipynb
@@ -1,5 +1,13 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "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."
+   ]
+  },
   {
    "attachments": {
     "Stephen_Cole_Kleene.png": {
diff --git a/lecture_material/15-regex/regex_lec_002.ipynb b/lecture_material/15-regex/regex_002.ipynb
similarity index 99%
rename from lecture_material/15-regex/regex_lec_002.ipynb
rename to lecture_material/15-regex/regex_002.ipynb
index 594a3f8867eaf377d4c5e23bf1fd2a19528d420e..c93af6d9679b9e141e7dc65d03fdaca3f97f23a9 100644
--- a/lecture_material/15-regex/regex_lec_002.ipynb
+++ b/lecture_material/15-regex/regex_002.ipynb
@@ -1,5 +1,13 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "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."
+   ]
+  },
   {
    "attachments": {
     "Stephen_Cole_Kleene.png": {
diff --git a/lecture_material/15-regex/self_practice.ipynb b/lecture_material/15-regex/self_practice.ipynb
index 984396067d864ee2554c4d1a68b5a440ea924bf8..4f687075c84e026c9cfcf66856b2cf08752662a2 100644
--- a/lecture_material/15-regex/self_practice.ipynb
+++ b/lecture_material/15-regex/self_practice.ipynb
@@ -1,5 +1,13 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "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."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,
@@ -344,7 +352,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.6"
+   "version": "3.8.10"
   }
  },
  "nbformat": 4,