highlight unexpected characters

.vscode/extensions.json

@@ -1,4 +1,8 @@
 {
-  "recommendations": ["tamasfe.even-better-toml", "bodil.prettier-toml"],
+  "recommendations": [
+    "tamasfe.even-better-toml",
+    "bodil.prettier-toml",
+    "fabiospampinato.vscode-highlight"
+  ],
   "unwantedRecommendations": ["bungcip.better-toml", "be5invis.toml"]
 }

.vscode/settings.json

@@ -1,5 +1,24 @@
 {
   "[toml]": {
     "editor.defaultFormatter": "bodil.prettier-toml"
+  },
+  "highlight.regexes": {
+    "(〜)": [
+      {
+        "borderWidth": "1px",
+        "borderStyle": "solid",
+        "borderColor": "yellow",
+        "color": "red"
+      }
+    ],
+    "([·•])": [
+      {
+        "borderWidth": "1px",
+        "borderStyle": "solid",
+        "borderColor": "yellow",
+        "color": "red"
+      }
+    ],
+    "([·᛫‧∘∙⋅◦⦁⸰⸱･𐄁])": [{ "color": "yellow" }]
   }
 }