Here’s an example. I scraped a wikipedia entry with the meta select. Here is the output:
URL="https://en.wikipedia.org/wiki/List_of_game_engines"
# This is the select line you will use in the config
SELECT="meta"
ATTR="content"
# You may need to use a template after the fact...
INDEX=3
*************** Output of SELECT: **************
index[0]: <meta charset="utf-8"/>
index[1]: <meta content="" name="ResourceLoaderDynamicStyles"/>
index[2]: <meta content="MediaWiki 1.35.0-wmf.27" name="generator"/>
index[3]: <meta content="origin" name="referrer"/>
index[4]: <meta content="origin-when-crossorigin" name="referrer"/>
index[5]: <meta content="origin-when-cross-origin" name="referrer"/>
**************
ATTR ('content') of index 3 = origin
Index 100% depends on the result of the scrape. If that select happened to return a couple different matches, you’d use index to pick which one you wanted.