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[docs] Improve embedding docs and other minor fixes

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pukkandan 2022-04-17 23:19:53 +05:30
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CONTRIBUTING.md
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@ -374,21 +374,21 @@ When extracting metadata try to do so from multiple sources. For example if `tit
#### Example
Say `meta` from the previous example has a `title` and you are about to extract it. Since `title` is a mandatory meta field you should end up with something like:
Say `meta` from the previous example has a `title` and you are about to extract it like:
```python
title = meta['title']
title = meta.get('title')
```
If `title` disappears from `meta` in future due to some changes on the hoster's side the extraction would fail since `title` is mandatory. That's expected.
If `title` disappears from `meta` in future due to some changes on the hoster's side the title extraction would fail.
Assume that you have some another source you can extract `title` from, for example `og:title` HTML meta of a `webpage`. In this case you can provide a fallback scenario:
Assume that you have some another source you can extract `title` from, for example `og:title` HTML meta of a `webpage`. In this case you can provide a fallback like:
```python
title = meta.get('title') or self._og_search_title(webpage)
```
This code will try to extract from `meta` first and if it fails it will try extracting `og:title` from a `webpage`.
This code will try to extract from `meta` first and if it fails it will try extracting `og:title` from a `webpage`, making the extractor more robust.
### Regular expressions