Prevent multiple emails separated by commas in email field (#6018)

Author: tsubery

priv/templates/phx.gen.auth/schema.ex

@@ -46,7 +46,9 @@ defmodule <%= inspect schema.module %> do
   defp validate_email(changeset, opts) do
     changeset
     |> validate_required([:email])
-    |> validate_format(:email, ~r/^[^\s]+@[^\s]+$/, message: "must have the @ sign and no spaces")
+    |> validate_format(:email, ~r/^[^@,;\s]+@[^@,;\s]+$/,
+      message: "must have the @ sign and no spaces"
+    )
     |> validate_length(:email, max: 160)
     |> maybe_validate_unique_email(opts)
   end