Special characters are not included in hashtag

It's an old post and for Drupal 8 version, but I've found myself with the same problem but in Drupal 7 and in spanish with the "ñ" character and what has worked for me is to change the regex pattern when parsing hashtags like this:

$twitter_tweets[$key]['tweet'] = preg_replace_callback('/#(\\w+)|@(\\w+)/u', function ($hash) {

Added "u" as the last character of the pattern. The "u" modifier indicates that the string must be read as an unicode string.

In Drupal 7 module, file "socialfeed.block.inc" in function "socialfeed_twitter_posts".

Maybe it can help you.

This issue is now resolved, please try the latest release.