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-rw-r--r--lib/PublicInbox/AltId.pm2
-rw-r--r--lib/PublicInbox/Search.pm2
2 files changed, 3 insertions, 1 deletions
diff --git a/lib/PublicInbox/AltId.pm b/lib/PublicInbox/AltId.pm
index 8ce70e46..3be6c73c 100644
--- a/lib/PublicInbox/AltId.pm
+++ b/lib/PublicInbox/AltId.pm
@@ -22,7 +22,7 @@ sub new {
         my ($class, $ibx, $spec, $writable) = @_;
         my ($type, $prefix, $query) = split(/:/, $spec, 3);
         $type eq 'serial' or die "non-serial not supported, yet\n";
-
+        $prefix =~ /\A\w+\z/ or warn "non-word prefix not searchable\n";
         my %params = map {
                 my ($k, $v) = split(/=/, uri_unescape($_), 2);
                 $v = '' unless defined $v;
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index fabf5301..86a6ad67 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -316,6 +316,8 @@ sub qp {
                 my $user_pfx = $self->{-user_pfx} = [];
                 for (@$altid) {
                         # $_ = 'serial:gmane:/path/to/gmane.msgmap.sqlite3'
+                        # note: Xapian supports multibyte UTF-8, /^[0-9]+$/,
+                        # and '_' with prefixes matching \w+
                         /\Aserial:(\w+):/ or next;
                         my $pfx = $1;
                         push @$user_pfx, "$pfx:", <<EOF;