FEP-eb48: Hashtags (#371)

Standardized method for identifying and displaying hashtags in posts across the Fediverse.

Reviewed-on: https://codeberg.org/fediverse/fep/pulls/371
Co-authored-by: AvidSeeker <avidseeker7@protonmail.com>
Co-committed-by: AvidSeeker <avidseeker7@protonmail.com>

fep/eb48/fep-eb48.md

@@ -0,0 +1,58 @@
+---
+slug: "eb48"
+title: Hashtags
+dateReceived: 2024-07-16
+discussionsTo: 'https://socialhub.activitypub.rocks/t/4369'
+title: Timeline Preferences
+authors: AvidSeeker <avidseeker7@protonmail.com>
+status: DRAFT
+---
+
+# FEP-eb48: Hashtags
+
+## Summary
+
+This proposal introduces a standardized method for identifying and displaying
+hashtags in posts across the Fediverse. The rules define what constitutes a
+hashtag and how it should be parsed and displayed, ensuring consistency and
+predictability across different platforms and clients.
+
+## Hashtag Rules
+
+A string is considered a hashtag if it meets the following criteria:
+
+1. It starts with the `#` symbol.
+2. It is followed by one or more alphanumeric characters (letters A-Z, a-z, or digits 0-9).
+3. It may include underscores (`_`) but must not include any other special characters, spaces, or punctuation within the hashtag itself.
+
+## Examples
+
+The following examples illustrate how hashtags should be identified and
+highlighted:
+
+- `#hashtag`
+- "`#hashtag`"
+- " `#hashtag`"
+- (`#hashtag`/#hashtag)
+- ( `#hashtag`/#hashtag)
+- ( `#hashtag` /#hashtag)
+- ( `#hashtag` / `#hashtag`)
+- -`#hashtag`
+- \_`#hashtag`
+- !`#hashtag`
+- ?`#hashtag`
+- @`#hashtag`
+- ;`#hashtag`
+- ,`#hashtag`
+- .'`#hashtag`
+- [`#hashtag`
+- &`#hashtag`
+- ^`#hashtag`
+
+## Copyright
+
+CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+
+To the extent possible under law, the authors of this Fediverse Enhancement
+Proposal have waived all copyright and related or neighboring rights to this
+work.