Issue #14500 has been reported by Sundeep (Sundeep Agarwal).

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Misc #14500: Missing Regexp documentation and clarification on behavior of \K for edge case
https://bugs.ruby-lang.org/issues/14500

* Author: Sundeep (Sundeep Agarwal)
* Status: Open
* Priority: Normal
* Assignee: 
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**Capturing** section (https://ruby-doc.org/core-2.5.0/Regexp.html#class-Regexp-label-Capturing)

* formatting issue: `n<sup>th</sup>`
* suggestion to add a note on `\0` similar to the note mentioned in **Special global variables** (https://ruby-doc.org/core-2.5.0/Regexp.html#class-Regexp-label-Special+global+variables) section about `$&`
* suggestion to add that numbered capturing groups is limited to `9`

**Anchors** section (https://ruby-doc.org/core-2.5.0/Regexp.html#class-Regexp-label-Anchors)

* suggestion to add documentation on `\K`
* need clarification if the below behavior seen is expected and mention it while adding documentation

```
$ echo 'aaa' | ruby -pe 'gsub(/a\K/, ":")'
a:aa:

$ # what I expected
$ echo 'aaa' | ruby -pe 'gsub(/(a)/, "\\1:")'
a:a:a:
```




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