diff --git a/src/grammars/sema.tmLanguage.json b/src/grammars/sema.tmLanguage.json
index 8f03646..c4b2d25 100644
--- a/src/grammars/sema.tmLanguage.json
+++ b/src/grammars/sema.tmLanguage.json
@@ -9,6 +9,9 @@
     {
       "include": "#comment"
     },
+    {
+      "include": "#regex"
+    },
     {
       "include": "#string"
     },
@@ -50,6 +53,17 @@
     }
   ],
   "repository": {
+    "regex": {
+      "name": "string.regexp.sema",
+      "begin": "#\"",
+      "end": "\"",
+      "patterns": [
+        {
+          "name": "string.regexp.sema",
+          "match": "\\\\."
+        }
+      ]
+    },
     "block-comment": {
       "name": "comment.block.sema",
       "begin": "#\\|",
diff --git a/tests/syntax-highlight-sync.test.ts b/tests/syntax-highlight-sync.test.ts
index f911dd2..a3825a4 100644
--- a/tests/syntax-highlight-sync.test.ts
+++ b/tests/syntax-highlight-sync.test.ts
@@ -30,6 +30,19 @@ describe('highlightToHtmlSync', () => {
     expect(out).toContain('<span class="tok-builtin">tool/policy-subjects</span>')
   })
 
+  it('classifies complete raw regex literals and regex builtins', async () => {
+    await preloadLanguage('sema')
+    const out = highlightToHtmlSync(
+      '(regex/match? #"\\d+" text)\n(regex/match #"\\\"[^\\\"]+\\\"" text)',
+      'sema',
+    )
+    const normalized = out.replaceAll('</span><span class="tok-string">', '')
+    expect(out).toContain('<span class="tok-builtin">regex/match?</span>')
+    expect(out).toContain('<span class="tok-builtin">regex/match</span>')
+    expect(normalized).toContain('<span class="tok-string">#"\\d+"</span>')
+    expect(normalized).toContain('<span class="tok-string">#"\\"[^\\"]+\\""</span>')
+  })
+
   it('supports non-sema languages too (json), unlike the old sema-only tokenizer', async () => {
     await preloadLanguage('json')
     const out = highlightToHtmlSync('{"a": 1}', 'json')