title: How can I get a JSON field value without `jq`?
body: <p>I'm trying to extract a value from a JSON in a limited environment where I cannot install any tools or download anything from the internet. The tools that I have available on the environment are the basic ones provided by busybox such as: <code>awk</code>, <code>grep</code>, and <code>sed</code>. No compilers or interpreters like Perl and Python are available.</p>
  
  <p>The JSON I'm trying to parse has a fixed scheme but it can be formatted in any valid way and I always need to get the value of the field <code>tag</code>.</p>
  
  <p>Examples of possible JSONs:</p>
  
  <pre><code>{"version":1,"name":"2","tag":"3"}
  </code></pre>
  
  <pre><code>{
      "version": 1,
      "tag":    "3",
      "name"   :"2"
  }
  </code></pre>