From ff66e26af0a59d3f63e7daf104a132f49f65879d Mon Sep 17 00:00:00 2001
From: Dorian Niemiec <dorian.niemiec@svrjs.org>
Date: Tue, 27 Aug 2024 12:06:23 +0200
Subject: [PATCH] Change regular expression for createRegex() function

---
 src/utils/createRegex.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/utils/createRegex.js b/src/utils/createRegex.js
index 987f8a0..c18cfd9 100644
--- a/src/utils/createRegex.js
+++ b/src/utils/createRegex.js
@@ -1,7 +1,11 @@
 const os = require("os");
 
 function createRegex(regex, isPath) {
-  const regexStrMatch = regex.match(/^\/((?:\\.|[^/\\])*)\/([a-zA-Z0-9]*)$/);
+  // The new regular expression supports single unescaped "/" within [], but not two unescaped "/".
+  // We needed to do it, because it's very hard to create the regex that matches two unescaped "/" within "[]" without ReDoS.
+  const regexStrMatch = regex.match(
+    /^\/((?:\\.|\/+(?:(?:\\.|[^\]\\/])*\])|[^/\\])*)\/([a-zA-Z0-9]*)$/,
+  );
   if (!regexStrMatch) throw new Error("Invalid regular expression: " + regex);
   const searchString = regexStrMatch[1];
   let modifiers = regexStrMatch[2];