Extended nicknames: allow dashes.

config/config.md

@@ -63,7 +63,7 @@ This filter replaces the filename (not the path) of an upload. For complete obfu
   * "masto": Copy verbatim, as in Mastodon.
   * "noop": Don't copy the subject.
 * `always_show_subject_input`: When set to false, auto-hide the subject field when it's empty.
-* `extended_nickname_format`: Set to `true` to use extended local nicknames format (allows underscore). This will break federation with
+* `extended_nickname_format`: Set to `true` to use extended local nicknames format (allows underscores/dashes). This will break federation with
     older software for theses nicknames.
 
 ## :fe

lib/pleroma/formatter.ex

@@ -18,7 +18,7 @@ def parse_tags(text, data \\ %{}) do
   def parse_mentions(text) do
     # Modified from https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
     regex =
-      ~r/@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]*@?[a-zA-Z0-9_](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/u
+      ~r/@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]*@?[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/u
 
     Regex.scan(regex, text)
     |> List.flatten()

lib/pleroma/user.ex

@@ -14,7 +14,7 @@ defmodule Pleroma.User do
   @email_regex ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
 
   @strict_local_nickname_regex ~r/^[a-zA-Z\d]+$/
-  @extended_local_nickname_regex ~r/^[a-zA-Z\d_]+$/
+  @extended_local_nickname_regex ~r/^[a-zA-Z\d_-]+$/
 
   schema "users" do
     field(:bio, :string)