# 4

This one was a lot of parsing, but nothing regexp can't do.
The first is quite straight forward, just check that all but `cid` are present.

The second was a bit of validation for each field, but again some simple regexp and number checking and the job is done 🙂

<details>
  <summary>Solutions</summary>
  <ol>
    <li>206</li>
    <li>123</li>
  </ol>
</details>