From bed21a150296a6b714bf5ad9271883525fd622cd Mon Sep 17 00:00:00 2001
From: Knut Finstermeier <finstermeier@mpusp.mpg.de>
Date: Wed, 29 Apr 2026 07:10:29 +0200
Subject: [PATCH] fix: regex demo in lesson  7

---
 lessons/lesson_07.ipynb | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/lessons/lesson_07.ipynb b/lessons/lesson_07.ipynb
index 9103379..c2c5863 100644
--- a/lessons/lesson_07.ipynb
+++ b/lessons/lesson_07.ipynb
@@ -272,16 +272,27 @@
    "source": [
     "import re\n",
     "\n",
-    "# # reading file\n",
-    "# with open(\"../data/towels.txt\", \"r\") as infile:\n",
-    "#     story = infile.read()\n",
+    "# This text comes from the book \"20,000 Leagues Under the Sea\" by Jules Verne, published in 1870.\n",
     "\n",
-    "# # create pattern\n",
-    "# pattern = \".*[H|h]itch *[H|h]iker.*\"\n",
-    "# regex = re.compile(pattern)\n",
+    "story = \"\"\"On the 6th of November, 1867, the frigate Abraham Lincoln departed at 3:00 PM from Brooklyn pier.\n",
+    "The crew numbered 307 men and officers.\n",
+    "Captain Farragut had placed a reward of $2,000 for whoever first sighted the creature.\n",
+    "Professor Aronnax, a marine biologist from Paris, stood at the bow scanning the horizon.\n",
+    "The animal, if it exists, must be of considerable size — perhaps 200 feet in length.\n",
+    "The sea was calm; visibility extended roughly 15 nautical miles.\n",
+    "At latitude 31° 15' N, longitude 136° 42' E, they found nothing.\n",
+    "After 3 weeks with no sightings, the crew grew restless.\n",
+    "Then, on November 28th at 11:17 PM, the lookout cried: Object sighted — bearing 315 degrees!\n",
+    "The creature emitted a pale phosphorescent light and moved at approximately 40 knots.\n",
+    "Aronnax estimated its mass at no less than 1,500 tons.\n",
+    "Impossible, said Conseil quietly, and yet — there it is.\"\"\"\n",
     "\n",
-    "# # search for pattern and print each line with the pattern in it\n",
-    "# print(regex.findall(story))"
+    "# create pattern\n",
+    "pattern = \".*\\d{1,2}:\\d{2} PM.*\"\n",
+    "regex = re.compile(pattern)\n",
+    "\n",
+    "# search for pattern and print each line with the pattern in it\n",
+    "print(regex.findall(story))"
    ]
   },
   {
@@ -292,7 +303,7 @@
     "- certain strings have specific meanings:\n",
     "  - `.*`    = any number of any character before/after our pattern except `\\n`, including 0 observations\n",
     "  - `*`     = any number of any character within our pattern, including 0 observations\n",
-    "  - `[H|h]` = one character, eiter an `H` or an `h`\n",
+    "  - `\\d{1,2}` = one or two digits\n",
     "- when compiling the search pattern, you can include certain flags\n",
     "  - `re.IGNORECASE` to have case insensitive matching\n",
     "  - `re.DOTALL` to have the `.` match all characters incl. the line end character `\\n`\n",
@@ -1359,7 +1370,7 @@
  "metadata": {
   "celltoolbar": "Slideshow",
   "kernelspec": {
-   "display_name": "default",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -1373,7 +1384,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.14.4"
+   "version": "3.11.0"
   }
  },
  "nbformat": 4,