diff --git a/extensions/ql-vscode/CHANGELOG.md b/extensions/ql-vscode/CHANGELOG.md
index 78615a87792..3ed535f2554 100644
--- a/extensions/ql-vscode/CHANGELOG.md
+++ b/extensions/ql-vscode/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [UNRELEASED]
 
 - Remove support for CodeQL CLI versions older than 2.18.4. [#3895](https://github.com/github/vscode-codeql/pull/3895)
+- Fix regex in CodeQL TextMate grammar that was silently failing. [#3903](https://github.com/github/vscode-codeql/pull/3903)
 
 ## 1.7.0 - 20 December 2024
 
diff --git a/extensions/ql-vscode/syntaxes/ql.tmLanguage.yml b/extensions/ql-vscode/syntaxes/ql.tmLanguage.yml
index fe10a86d03d..9348f74f763 100644
--- a/extensions/ql-vscode/syntaxes/ql.tmLanguage.yml
+++ b/extensions/ql-vscode/syntaxes/ql.tmLanguage.yml
@@ -1065,7 +1065,7 @@ repository:
     beginPattern: '#as'
     # Ends after the first identifier we encounter.
     # REVIEW: Make similar to import-as-clause.
-    end: '(?<=(?#id-character)(?#end-of-id))'
+    end: '(?<=(?#id-character))(?#end-of-id)'
     match: meta.block.select-as-clause.ql
     patterns:
     - include: '#non-context-sensitive'
diff --git a/syntaxes/ql.tmLanguage.json b/syntaxes/ql.tmLanguage.json
index a8b5c3909a2..902ef034e88 100644
--- a/syntaxes/ql.tmLanguage.json
+++ b/syntaxes/ql.tmLanguage.json
@@ -675,9 +675,9 @@
               "begin": "(?x)(?<=/\\*\\*)([^*]|\\*(?!/))*$",
               "while": "(?x)(^|\\G)\\s*([^*]|\\*(?!/))(?=([^*]|[*](?!/))*$)",
               "patterns": [
-
-
-
+                
+                
+                
                 {
                   "match": "(?x)\\G\\s* (@\\S+)",
                   "name": "keyword.tag.ql"
@@ -1469,7 +1469,7 @@
       }
     },
     "select-as-clause": {
-      "end": "(?x)(?<=(?:[0-9A-Za-z_])(?:(?!(?:[0-9A-Za-z_]))))",
+      "end": "(?x)(?<=(?:[0-9A-Za-z_]))(?:(?!(?:[0-9A-Za-z_])))",
       "match": "(?x)meta.block.select-as-clause.ql",
       "patterns": [
         {
@@ -1540,4 +1540,4 @@
       "name": "constant.character.escape.ql"
     }
   }
-}
+}
\ No newline at end of file