diff --git a/lib/utils.js b/lib/utils.js
index 2cf88ca..0516ccd 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -103,7 +103,7 @@ function findPossibleIndexes(code, identifiers, filter) {
   }
 
   const pattern = new RegExp(
-    "\\b(?:" + identifiers.join("|") + ")\\b",
+    "\\b(?:" + identifiers.map(escapeRegExp).join("|") + ")\\b",
     "g"
   );
 
@@ -118,6 +118,11 @@ function findPossibleIndexes(code, identifiers, filter) {
   return possibleIndexes;
 }
 
+// RegExp.escape() polyfill, since Node 22.x doesn't have it
+function escapeRegExp (regexp) {
+  return regexp.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+};
+
 exports.findPossibleIndexes = findPossibleIndexes;
 
 function findLikelyIndexes(code, identifiers) {