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10-regular-expression-matching/README.md

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+<h2><a href="https://leetcode.com/problems/regular-expression-matching/">10. Regular Expression Matching</a></h2><h3>Hard</h3><hr><div><p>Given an input string <code>s</code>&nbsp;and a pattern <code>p</code>, implement regular expression matching with support for <code>'.'</code> and <code>'*'</code> where:</p>
+
+<ul>
+	<li><code>'.'</code> Matches any single character.​​​​</li>
+	<li><code>'*'</code> Matches zero or more of the preceding element.</li>
+</ul>
+
+<p>The matching should cover the <strong>entire</strong> input string (not partial).</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre><strong>Input:</strong> s = "aa", p = "a"
+<strong>Output:</strong> false
+<strong>Explanation:</strong> "a" does not match the entire string "aa".
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre><strong>Input:</strong> s = "aa", p = "a*"
+<strong>Output:</strong> true
+<strong>Explanation:</strong> '*' means zero or more of the preceding element, 'a'. Therefore, by repeating 'a' once, it becomes "aa".
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre><strong>Input:</strong> s = "ab", p = ".*"
+<strong>Output:</strong> true
+<strong>Explanation:</strong> ".*" means "zero or more (*) of any character (.)".
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= s.length&nbsp;&lt;= 20</code></li>
+	<li><code>1 &lt;= p.length&nbsp;&lt;= 30</code></li>
+	<li><code>s</code> contains only lowercase English letters.</li>
+	<li><code>p</code> contains only lowercase English letters, <code>'.'</code>, and&nbsp;<code>'*'</code>.</li>
+	<li>It is guaranteed for each appearance of the character <code>'*'</code>, there will be a previous valid character to match.</li>
+</ul>
+</div>