[Confluence] New method 'scrap_regex_from_page' + docs + example

[gkowalc]

This method performs the same function as scrap_regex_from_issue for jira:

• For given page_id and regex variable it returns a list of regex matches from a confluence page html storage format.

• Docs + examples included.

• Method tested on confluence cloud and latest server LTS version.

• I also added one additional condition to the scrap_regex_from_issue (JIRA) method ( to prevent NoneType error)

[codecov-commenter]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (7c3dcee) 34.35% compared to head (4db577a) 34.31%.

Files	Patch %	Lines
atlassian/confluence.py	14.28%	12 Missing :warning:
atlassian/jira.py	0.00%	9 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1327 +/- ## ========================================== - Coverage 34.35% 34.31% -0.04% ========================================== Files 45 45 Lines 8302 8317 +15 Branches 1158 1163 +5 ========================================== + Hits 2852 2854 +2 - Misses 5336 5349 +13 Partials 114 114 ```

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[gonchik]

@gkowalc could you a use cases please ?

[gkowalc]

@gonchik do you mean what are the use cases of this method?

• Loop through the pages within a space to get hardcoded links/customer data etc. Also feature can be extended in a way to update those regex values with the new value
• Security/compliance requirement: searching for credentials/passwords added to confluence pages by the users
• Main Confluence search functionality with applied regex is not ideal and might not be able to retrieve all results.