[Hold for Payment 13 August] Implement Hyperlink and Email link HTML to markdown conversion

[Jag96]

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Related to #3047, similar to Expensify/expensify-common#392. Email and link MD->HTML version can be found here

Action Performed:

Copied a hyperlink from slack to E.cash

Expected Result:

Rules of parsing would be as

1. [html](www.google.com) When <a href="www.google.com">html</a> and you will see this type pf link as html.
2. www.google.com when <a href="www.google.com">www.google.com</a> and you will see this type pf link as www.google.com.
3. abc@gmail.com when <a href="abc@gmail.com">abc@gmail.com</a> and visible as abc@gmail.com.

Actual Result:

Message just pasted text

Platform:

Where is this issue occurring?

• Web
• Desktop App
• Mobile Web

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[MelvinBot]

Triggered auto assignment to @MitchExpensify (AutoAssignerTriage), see https://stackoverflow.com/c/expensify/questions/4749 for more details.

[parasharrajat]

A suggestion to the description.
Rules of parsing would be as

1. [html](www.google.com) When <a href="www.google.com">html</a> and you will see this type of link as html.
2. www.google.com when <a href="www.google.com">www.google.com</a> and you will see this type of link as www.google.com.
3. abc@gmail.com when <a href="abc@gmail.com">abc@gmail.com</a> and visible as abc@gmail.com.

[Jag96]

Sounds good, updated!

[parasharrajat]

To match anchor tags we can use this
<(a)(?:href=(['"])(.*?)\2|"[^"]*"|'[^']*'|[^'">])*>(.*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))

1. Groups 3 and 4 contain the URL and text respectively.
2. We will use a process method that will parse all three types of URLs based on these rules.
   a. if g2 and g3 are not equal, then output [g3](g2). we don't need to worry even if href was an email it just works.
   b. If not a then the output would be simple g2. We don't care if it's an email or a normal link.

[MitchExpensify]

Replicated! Looks like a good external issue right @Jag96?