diff --git a/src/array/two-sum.js b/src/array/two-sum.js
index 5ecac6f..6346649 100644
--- a/src/array/two-sum.js
+++ b/src/array/two-sum.js
@@ -34,4 +34,29 @@ const twoSum = (nums, target) => {
   return null;
 };
 
+/**
+ * Brute Force
+ */
+
+/**
+ * 
+ * @param {number[]} nums
+ * @param {number} target
+ * @return {number[]}
+ */
+/**
+ * 
+ */
+const twoSumBrute = function (nums, target) {
+	for (let i = 0; i < nums.length - 1; i++) {
+		for (let nextIndex = i + 1; nextIndex < nums.length; nextIndex++) {
+			if (target === nums[i] + nums[nextIndex]) {
+				return [i, nextIndex];
+			}
+		}
+	}
+};
+
+console.log(twoSumBrute([3, 2, 4], 6)); // [0,1]
+ 
 export { twoSum };
diff --git a/src/string/valid-palindrome-ii.js b/src/string/valid-palindrome-ii.js
index 9add85a..6450585 100644
--- a/src/string/valid-palindrome-ii.js
+++ b/src/string/valid-palindrome-ii.js
@@ -44,4 +44,19 @@ const isPalindromic = (s, i, j) => {
   return true;
 };
 
+/**
+ * Using RegExp
+ */
+
+var isPalindrome = function(s) {
+  s = s.replace(/[^0-9a-z]/gi, '');
+  return (
+    s
+      .split('')
+      .reverse()
+      .join('')
+      .toLowerCase() == s.toLowerCase()
+  );
+};
+
 export { validPalindrome };