diff --git a/src/parse/find-indexes.js b/src/parse/find-indexes.js
index 7e23bdf3f..cfcf07df5 100644
--- a/src/parse/find-indexes.js
+++ b/src/parse/find-indexes.js
@@ -1,5 +1,6 @@
 import CHAR_CODE from "../constant/char-code.js"
 
+import escapeRegExp from "../util/escape-regexp.js"
 import shared from "../shared.js"
 
 function init() {
@@ -9,12 +10,31 @@ function init() {
 
   function findIndexes(code, identifiers) {
     const indexes = []
+    const { length } = identifiers
 
-    if (identifiers.length === 0) {
+    if (length === 0) {
       return indexes
     }
 
-    const pattern = new RegExp("\\b(?:" + identifiers.join("|") + ")\\b", "g")
+    const lastIndex = length - 1
+
+    const pattern = new RegExp(
+      "\\b(?:" +
+      (() => {
+        let i = -1
+        let source = ""
+
+        while (++i < length) {
+          source +=
+            escapeRegExp(identifiers[i]) +
+            (i === lastIndex ? "" : "|")
+        }
+
+        return source
+      })() +
+      ")\\b",
+      "g"
+    )
 
     let match
 
diff --git a/src/util/is-own-proxy.js b/src/util/is-own-proxy.js
index 283ead6ab..3333a4b23 100644
--- a/src/util/is-own-proxy.js
+++ b/src/util/is-own-proxy.js
@@ -2,6 +2,7 @@ import ESM from "../constant/esm.js"
 
 import OwnProxy from "../own/proxy.js"
 
+import escapeRegExp from "../util/escape-regexp.js"
 import { inspect } from "../safe/util.js"
 import isObjectLike from "./is-object-like.js"
 import shared from "../shared.js"
@@ -11,11 +12,9 @@ function init() {
     PACKAGE_PREFIX
   } = ESM
 
-  let inspectDepth = 0
-
   const endMarkerRegExp = new RegExp(
     "[\\[\"']" +
-    PACKAGE_PREFIX +
+    escapeRegExp(PACKAGE_PREFIX) +
     ":proxy['\"\\]]\\s*:\\s*1\\s*\\}\\s*.?$"
   )
 
@@ -41,6 +40,8 @@ function init() {
     showProxy: true
   }
 
+  let inspectDepth = 0
+
   function isOwnProxy(value) {
     return OwnProxy.instances.has(value) ||
       isOwnProxyFallback(value)