trial for link checker

.github/mlc_config.json

@@ -0,0 +1,15 @@
+{
+    "ignorePatterns": [
+        {
+            "pattern": "^http://ignored-domain.com"
+        }
+    ],
+    "httpHeaders": [
+    {
+      "urls": ["https://github.com/", "https://guides.github.com/", "https://help.github.com/", "https://docs.github.com/"],
+      "headers": {
+        "Accept-Encoding": "zstd, br, gzip, deflate"
+      }
+    }
+  ]
+}

.github/workflows/action.yml

@@ -0,0 +1,18 @@
+name: Check Markdown links
+
+on:
+  push: [master]
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    # check out the latest version of the code
+    steps:
+    - uses: actions/checkout@v3
+    # checks the status of hyperlinks in .md files in verbose mode
+    name: Check links
+    - uses: gaurav-nelson/github-action-markdown-link-check@v1
+      with:
+        use-quiet-mode: 'yes'
+        use-verbose-mode: 'yes'
+        config-file: 'mlc_config.json'

bin/lesson_check.py

@@ -556,7 +556,7 @@ def __init__(self, args, filename, metadata, metadata_len, text, lines, doc):
     (re.compile(r'README\.md'), CheckNonJekyll),
     (re.compile(r'index\.md'), CheckIndex),
     (re.compile(r'reference\.md'), CheckReference),
-    (re.compile(os.path.join('_episodes', '*\.md')), CheckEpisode),
+    (re.compile(os.path.join('_episodes', r'.*\.md')), CheckEpisode),
     (re.compile(r'.*\.md'), CheckGeneric)
 ]