Given a string code representing a code snippet, return true if it is a valid tag snippet, or false otherwise.

A code snippet is considered valid if all of the following conditions are met:

1. The entire code must be enclosed by a single valid root tag: <TAG_NAME>TAG_CONTENT</TAG_NAME>.

2. A valid TAG_NAME consists only of uppercase English letters, and its length must be in the range $[1, 9]$.

3. A start tag is formatted as <TAG_NAME>.

4. An end tag is formatted as </TAG_NAME>, where the TAG_NAME matches the corresponding start tag.

5. A valid TAG_CONTENT may contain valid closed tags, cdata, or any characters, provided that start tags and end tags are properly paired and nested.

6. A cdata section begins with <![CDATA[ and ends at the first subsequent occurrence of ]]>. The enclosed text, CDATA_CONTENT, is treated as raw text and is not parsed for tags.

7. Tags must be correctly matched and nested. A tag cannot be closed if there are open child tags inside it.

8. Unmatched '<' characters, unmatched <![CDATA[, or unmatched ]]> are strictly invalid.

Constraints:

• $1 \leq$ code.length $\leq 500$

• code consists of English letters, digits, '<', '>', '/', '!', '[', ']', '.', and ' '.

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.