1 files changed, 51 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/no-invalid-regexp.js b/tools/eslint/lib/rules/no-invalid-regexp.js
new file mode 100644
index 0000000000..cea5372f15
--- /dev/null
+++ b/tools/eslint/lib/rules/no-invalid-regexp.js
@@ -0,0 +1,51 @@
+/**
+ * @fileoverview Validate strings passed to the RegExp constructor
+ * @author Michael Ficarra
+ * @copyright 2014 Michael Ficarra. All rights reserved.
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+var espree = require("espree");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    function isString(node) {
+        return node && node.type === "Literal" && typeof node.value === "string";
+    }
+
+    function check(node) {
+        if (node.callee.type === "Identifier" && node.callee.name === "RegExp" && isString(node.arguments[0])) {
+            var flags = isString(node.arguments[1]) ? node.arguments[1].value : "";
+
+            try {
+                void new RegExp(node.arguments[0].value);
+            } catch(e) {
+                context.report(node, e.message);
+            }
+
+            if (flags) {
+
+                try {
+                    espree.parse("/./" + flags, { ecmaFeatures: context.ecmaFeatures });
+                } catch (ex) {
+                    context.report(node, "Invalid flags supplied to RegExp constructor '" + flags + "'");
+                }
+            }
+
+        }
+    }
+
+    return {
+        "CallExpression": check,
+        "NewExpression": check
+    };
+
+};