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+<h2><ahref="https://leetcode.com/problems/valid-palindrome/">125. Valid Palindrome</a></h2><h3>Easy</h3><hr><div><p>A phrase is a <strong>palindrome</strong> if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.</p>
+
+<p>Given a string <code>s</code>, return <code>true</code><em> if it is a <strong>palindrome</strong>, or </em><code>false</code><em> otherwise</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> s = "A man, a plan, a canal: Panama"
+<strong>Output:</strong> true
+<strong>Explanation:</strong> "amanaplanacanalpanama" is a palindrome.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> s = "race a car"
+<strong>Output:</strong> false
+<strong>Explanation:</strong> "raceacar" is not a palindrome.
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> s = " "
+<strong>Output:</strong> true
+<strong>Explanation:</strong> s is an empty string "" after removing non-alphanumeric characters.
+Since an empty string reads the same forward and backward, it is a palindrome.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+<li><code>1 &lt;= s.length &lt;= 2 * 10<sup>5</sup></code></li>
+<li><code>s</code> consists only of printable ASCII characters.</li>
+</ul>
+</div>