fix: room chat - whisper displays 1 mention when 2 mentions are send in specific way

[NJ-2020]

Fixed Issues

$ Expensify/App#46299
PROPOSAL: Expensify/App#46299 (comment)

Tests

1. What unit/integration tests cover your change? What autoQA tests cover your change?
2. What tests did you perform that validates your changed worked?
3. Go to Expensify App
4. Tap on a room chat
5. Mention 2 user with minus sign in between i.e #user1-#user2
6. Verify that whisper display 2 user

QA

1. What does QA need to do to validate your changes?
2. What areas to they need to test for regressions?
3. Same as Tests

Details

Tests

1. Go to Expensify App
2. Tap on a room chat
3. Mention 2 user with minus sign in between i.e #user1-#user2
4. Verify that whisper display 2 user

• Verify that no errors appear in the JS console

Offline tests

Same as Tests

QA Steps

Same as Tests

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
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  • Android: mWeb Chrome
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  • iOS: mWeb Safari
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  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop

[rojiphil]

@NJ-2020 Can you please fill in the PR Author Checklist and follow the contributing guidelines as mentioned here and here.
The PR Author Checklist must be the contents of the PR description.

[NJ-2020]

@rojiphil Done

[NJ-2020]

I remove the minus sign - after 0-9 because it will match any word containing minus sign - meaning

If we not remove the minus sign - and we type #user1-#user2 the output will be:
#user1- #user2

After removing:
#user1 #user2

[NJ-2020]

I think if we remove the - minus sign it will cause other issue like:
typing #room-test the mention-report tag will only wrap #room

But if we don't remove the - minus sign it will show like this #user1- #user2 if we type #user1-#user2

[rlinoz]

Tests are failling actually

[NJ-2020]

Yes because the minus sign is removed after 0-9

[rojiphil]

Yes because the minus sign is removed after 0-9

@NJ-2020 It does not look correct to remove the hyphen.

[rojiphil]

I am not sure why we need to look for the characters in [^ \n*~_] before the actual group name starts with #. Since a room mention is a string that starts with the '#' symbol, can we not use # for negative lookbehind i.e. something like shown below?
@NJ-2020 @rlinoz What do you think?

[rlinoz]

I believe the problem with that approach is that it would match things we don't really want, like # inside links working as anchor, like this:

I don't know why we ever allowed _ though, which make sme think that maybe we can just remove that.

[rojiphil]

I believe the problem with that approach is that it would match things we don't really want, like # inside links working as anchor, like this

Yeah, that makes sense.

I don't know why we ever allowed _ though, which make me think that maybe we can just remove that.

Ah! So, we can ignore # as starting symbol for the room name if it is preceded by _ or -. Instead, the valid ones are space, newline, star, and tilde symbols. If # is preceded by any of these, we will consider this to be the start of a room name. This makes sense.
And sorry as I missed this point when it was mentioned in the issue here.

[NJ-2020]

Sorry for the delay
So should I remove the minus sign - and the underscore _ here

expensify-common/lib/ExpensiMark.ts

Line 306 in e97172c

regex: /(?<![^ \n*~_-])(#[\p{Ll}0-9]{1,99})(?![^<]*(?:<\/pre>|<\/code>|<\/a>))/gimu,

Just to make sure?

[rojiphil]

Sorry for the delay
So should I remove the minus sign - and the underscore _ here

yes. That's correct. Also, we should revert the change here as that's expected.

[NJ-2020]

Done

[rojiphil]

@NJ-2020 The tests are failing. Did we break anything? Please check.

[NJ-2020]

Ah!, I know why we include the underscore inside the reportMentions regex, we include the underscore because we want to allow user to type italic room name

expensify-common/__tests__/ExpensiMark-HTML-test.js

Lines 2266 to 2269 in f11184e

	test('room mention with italic, bold and strikethrough styles', () => {
	const testString =
	'#room' +
	' _#room_' +

expensify-common/__tests__/ExpensiMark-HTML-test.js

Lines 2285 to 2287 in f11184e

	const resultString =
	'<mention-report>#room</mention-report>' +
	' <em><mention-report>#room</mention-report></em>' +

As we can see the expected result if we put the underscore before and after the room name it should show in italic way i.e _#room_ should show #room

cc: @rojiphil @rlinoz

[rlinoz]

Ah that makes sense, let me investigate a little then I will get back to this.

[rlinoz]

I did some testing I think this fixes it: (?<=^|[ \n][*~_]?)

The idea is to match the special characters only if they are preceded by newline/space.

Let me know what you think @rojiphil @NJ-2020