diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b96524..527ff1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+* Fix possible regular expression catastrophic backtracking [\#105](https://github.com/anandthakker/doiuse/pull/105)
+
 ## 4.3.1 (2020-10-30)
 
 * Optimize package size by ignoring .idea and .github folders
diff --git a/data/features.js b/data/features.js
index 860d7d1..bcd15ac 100644
--- a/data/features.js
+++ b/data/features.js
@@ -1,18 +1,16 @@
 var list = require('postcss/lib/list')
 var pats = {
   attrcc: '[^\\~|^$*\\]]*',
-  brackets: /(\[[^\]]*\]|\([^\)]*\))/.source,
-  nobrackets: /[^\[\]\(\)]/.source
+  brackets: /\[[^\]]*\]|\([^\)]*\)/g
 }
+
 function matchOutsideOfBrackets(pat) {
   if (!(pat instanceof RegExp)) {
     throw new TypeError('matchOutsideOfBrackets expects a RegExp')
   }
-  var fullPat = new RegExp(
-    '^(' + pats.brackets + '?' + pats.nobrackets + '*)*' + pat.source
-  )
-  return function match(str) {
-    return pat.test(str) && fullPat.test(str)
+
+  return function(str) {
+	  return pat.test(str.replace(pats.brackets, ''))
   }
 }
 
diff --git a/package-lock.json b/package-lock.json
index 825e4a8..54bb951 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "doiuse",
-  "version": "4.2.0",
+  "version": "4.3.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2899,8 +2899,26 @@
       "requires": {
         "extend-shallow": "^3.0.2",
         "safe-regex": "^1.1.0"
+      },
+      "dependencies": {
+        "safe-regex": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+          "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "ret": "~0.1.10"
+          }
+        }
       }
     },
+    "regexp-tree": {
+      "version": "0.1.21",
+      "resolved": "https://registry.npmjs.org/regexp-tree/-/regexp-tree-0.1.21.tgz",
+      "integrity": "sha512-kUUXjX4AnqnR8KRTCrayAo9PzYMRKmVoGgaz2tBuz0MF3g1ZbGebmtW0yFHfFK9CmBjQKeYIgoL22pFLBJY7sw==",
+      "dev": true
+    },
     "regexp.prototype.flags": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/regexp.prototype.flags/-/regexp.prototype.flags-1.3.0.tgz",
@@ -2998,13 +3016,12 @@
       "dev": true
     },
     "safe-regex": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
-      "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-2.1.1.tgz",
+      "integrity": "sha512-rx+x8AMzKb5Q5lQ95Zoi6ZbJqwCLkqi3XuJXp5P3rT8OEc6sZCJG5AE5dU3lsgRr/F4Bs31jSlVN+j5KrsGu9A==",
       "dev": true,
-      "optional": true,
       "requires": {
-        "ret": "~0.1.10"
+        "regexp-tree": "~0.1.1"
       }
     },
     "semver": {
@@ -3408,6 +3425,18 @@
         "extend-shallow": "^3.0.2",
         "regex-not": "^1.0.2",
         "safe-regex": "^1.1.0"
+      },
+      "dependencies": {
+        "safe-regex": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+          "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "ret": "~0.1.10"
+          }
+        }
       }
     },
     "to-regex-range": {
diff --git a/package.json b/package.json
index 39af242..2ea1bb4 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,7 @@
     "@babel/core": "^7.12.3",
     "mock-fs": "^4.13.0",
     "postcss-import": "^13.0.0",
+    "safe-regex": "^2.1.1",
     "tape": "^5.0.1"
   },
   "scripts": {
diff --git a/test/regex.js b/test/regex.js
new file mode 100644
index 0000000..0380657
--- /dev/null
+++ b/test/regex.js
@@ -0,0 +1,26 @@
+const test = require('tape')
+const safe = require('safe-regex')
+const features = require('../data/features')
+
+regexes = []
+
+for (var feature of Object.values(features)) {
+	for (var property of Object.values(feature)) {
+		if (!property || !(property instanceof Array)){
+			continue;
+		}
+
+		for (var item of property) {
+		  if (item instanceof RegExp) {
+			  regexes.push(item)
+		  }
+		}
+	}
+}
+
+for (var regex of regexes) {
+	test('Regex safety check: /' + regex.source + '/', function(t) {
+		t.ok(safe(regex))
+		t.end()
+	})
+}