1 files changed, 33 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/no-regex-spaces.js b/tools/eslint/lib/rules/no-regex-spaces.js
new file mode 100644
index 0000000000..edbf76d513
--- /dev/null
+++ b/tools/eslint/lib/rules/no-regex-spaces.js
@@ -0,0 +1,33 @@
+/**
+ * @fileoverview Rule to count multiple spaces in regular expressions
+ * @author Matt DuVall <http://www.mattduvall.com/>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    return {
+
+        "Literal": function(node) {
+            var token = context.getFirstToken(node),
+                nodeType = token.type,
+                nodeValue = token.value,
+                multipleSpacesRegex = /( {2,})+?/,
+                regexResults;
+
+            if (nodeType === "RegularExpression") {
+                regexResults = multipleSpacesRegex.exec(nodeValue);
+
+                if (regexResults !== null) {
+                    context.report(node, "Spaces are hard to count. Use {" + regexResults[0].length + "}.");
+                }
+            }
+        }
+    };
+
+};