regular-expression-matching

Regular Expression Matching

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isMatch

Given an input string <code>s</code>&nbsp;and a pattern <code>p</code>, implement regular expression matching with support for <code>&#39;.&#39;</code> and <code>&#39;*&#39;</code> where:

<ul>
	<li><code>&#39;.&#39;</code> Matches any single character.​​​​</li>
	<li><code>&#39;*&#39;</code> Matches zero or more of the preceding element.</li>
</ul>

The matching should cover the entire input string (not partial).

&nbsp;
Example 1:

<pre>
Input: s = &quot;aa&quot;, p = &quot;a&quot;
Output: false
Explanation: &quot;a&quot; does not match the entire string &quot;aa&quot;.
</pre>

Example 2:

<pre>
Input: s = &quot;aa&quot;, p = &quot;a*&quot;
Output: true
Explanation: &#39;*&#39; means zero or more of the preceding element, &#39;a&#39;. Therefore, by repeating &#39;a&#39; once, it becomes &quot;aa&quot;.
</pre>

Example 3:

<pre>
Input: s = &quot;ab&quot;, p = &quot;.*&quot;
Output: true
Explanation: &quot;.*&quot; means &quot;zero or more (*) of any character (.)&quot;.
</pre>

&nbsp;
Constraints:

<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>&#39;.&#39;</code>, and&nbsp;<code>&#39;*&#39;</code>.</li>
	<li>It is guaranteed for each appearance of the character <code>&#39;*&#39;</code>, there will be a previous valid character to match.</li>
</ul>

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