oEmbeds: allow embedding Twitter Profiles with a trailing slash

[jeherve]

This is a follow-up to #38003.

#### Steps to reproduce

1. Go to Posts > Add New
2. On a new line, paste a Twitter profile URL, without a trailing slash, such as https://twitter.com/jeherve
3. The URL will be transformed into an embed block (Twitter variation).
4. Now, paste a Twitter profile URL with a trailing slash, e.g. https://twitter.com/wordpress/
5. You'll notice that the embed fails for this URL.

This appears to be because we do not currently support trailing slashes for profile URLs:

'#https?://(www\.)?twitter\.com/\w{1,15}$#i' => array( 'https://publish.twitter.com/oembed', true ),
-- https://core.trac.wordpress.org/browser/trunk/src/wp-includes/class-wp-oembed.php#L68

It seems that this was done on purpose when those regexes were added:

Turns out that Twitter's API doesn't like trailing slashes so I'm going to remove the optional slash from the regex.

-- https://core.trac.wordpress.org/ticket/38003#comment:9

Would it be possible to add the trailing slash today, or is this still an issue?

[jeherve]

Allow trailing slash in Twitter Profile embeds

[skithund]

It's still an issue. Twitter API doesn't like the trailing slash.

​https://publish.twitter.com/oembed?url=https://twitter.com/TwitterDev/

[jeherve]

Ah, I missed that in my test. Good call. Closing this then. 👍

I've reported the issue to Twitter here:

• ​https://twittercommunity.com/t/oembed-does-not-support-trailing-slash/164797?u=jeherve