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What pattern is matched?

The regex looks for /#/ within the content and will proceed to replace anything matching /(^|\s|\b)#myhashtag/

Can this be enabled with other content?

Possible - try applying the filter bp_activity_hashtags_filter

See extra configuration

Why convert #hashtags into links before the database save?

The trick with activity search_terms (which is used for @atmentions) is the ending since BuddyPress's sql for searching is %%term%% so #child would match #children

What url is used?

you may define a slug for hashtags via the admin settings page

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