FIX: Correctly censor strings starting or ending with non-word characters (#6445)

test/javascripts/lib/pretty-text-test.js.es6

@@ -16,7 +16,7 @@ const rawOpts = {
     enable_markdown_linkify: true,
     markdown_linkify_tlds: "com"
   },
-  censoredWords: "shucks|whiz|whizzer|a**le|badword*",
+  censoredWords: "shucks|whiz|whizzer|a**le|badword*|shuck$|café|$uper",
   getURL: url => url
 };
 
@@ -959,6 +959,25 @@ QUnit.test("censoring", assert => {
     "<p>I have a pen, I have an ■■■■■</p>",
     "it escapes regexp chars"
   );
+
+  assert.cooked(
+    "Aw shuck$, I can't fix the problem with money",
+    "<p>Aw ■■■■■■, I can't fix the problem with money</p>",
+    "it works for words ending in non-word characters"
+  );
+
+  assert.cooked(
+    "Let's go to a café today",
+    "<p>Let's go to a ■■■■ today</p>",
+    "it works for words ending in accented characters"
+  );
+
+  assert.cooked(
+    "Discourse is $uper amazing",
+    "<p>Discourse is ■■■■■ amazing</p>",
+    "it works for words starting with non-word characters"
+  );
+
   assert.cooked(
     "No badword or apple here plz.",
     "<p>No ■■■■■■■ or ■■■■■ here plz.</p>",