<p></p>
<p><b>@1ec5</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5439#discussion_r1995945136">app/models/social_link.rb</a>:</p>
<pre style='color:#555'>> +
+class SocialLink < ApplicationRecord
+  belongs_to :user
+
+  validates :url, :format => { :with => %r{\Ahttps?://.+\z}, :message => :http_parse_error }
+
+  URL_PATTERNS = {
+    :bluesky => %r{\Ahttps?://(?:www\.)?bsky\.app/profile/([a-zA-Z0-9\._-]+)},
+    :discord => %r{\Ahttps?://(?:www\.)?discord\.com/users/(\d+)},
+    :facebook => %r{\Ahttps?://(?:www\.)?facebook\.com/([a-zA-Z0-9.]+)},
+    :github => %r{\Ahttps?://(?:www\.)?github\.com/([a-zA-Z0-9_-]+)},
+    :gitlab => %r{\Ahttps?://(?:www\.)?gitlab\.com/([a-zA-Z0-9_-]+)},
+    :instagram => %r{\Ahttps?://(?:www\.)?instagram\.com/([a-zA-Z0-9._]+)},
+    :linkedin => %r{\Ahttps?://(?:www\.)?linkedin\.com/in/([a-zA-Z0-9_-]+)},
+    :line => %r{\Ahttps?://(?:www\.)?line\.me/ti/p/([a-zA-Z0-9_-]+)},
+    :mastodon => %r{\Ahttps?://(?:(?:www\.)?mastodon\.social|en\.osm\.town)/@([a-zA-Z0-9_]+)},
</pre>
<p dir="auto">Bluesky also uses a leading at sign, but only Mastodon uses two at signs as far as I know.</p>

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