lib/PublicInbox/LeiInput.pm |  2 +-
 t/lei-tag.t                 | 14 +++++++++++---

diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm
index 84fc579dc4803b48624b2e445db8efddbf9a1c37..a1dcc907252f47d7716a83e799e2912a34be2416 100644
--- a/lib/PublicInbox/LeiInput.pm
+++ b/lib/PublicInbox/LeiInput.pm
@@ -30,7 +30,7 @@ 	L => sub {
 		my ($label) = @_;
 		length($label) >= $L_MAX and
 			return "`$label' too long (must be <= $L_MAX)";
-		$label =~ m{\A[a-z0-9_](?:[a-z0-9_\-\./\@,]*[a-z0-9])?\z}i ?
+		$label =~ m{\A[a-z0-9_](?:[a-z0-9_\-\./\@,]*[a-z0-9])?\z} ?
 			undef : "`$label' is invalid";
 	},
 	kw => sub {
diff --git a/t/lei-tag.t b/t/lei-tag.t
index 44e4659fc2262db3b76420c85eae9d3f3210d28f..5941cd0f3da7f91f7550a03a2bf45d72cdf8ee47 100644
--- a/t/lei-tag.t
+++ b/t/lei-tag.t
@@ -84,11 +84,19 @@ 			msg => 'external-only message');
 	lei_ok(qw(ls-label));
 	is($lei_out, "nope\nqp\nurgent\n", 'ls-label shows qp');
 
-	lei_ok qw(tag -F eml t/utf8.eml +L:INBOX +L:x);
+	lei_ok qw(tag -F eml t/utf8.eml +L:inbox +L:x);
 	lei_ok qw(q m:testmessage@example.com);
-	$check_kw->([qw(answered seen)], L => [qw(INBOX nope urgent x)]);
+	$check_kw->([qw(answered seen)], L => [qw(inbox nope urgent x)]);
 	lei_ok(qw(ls-label));
-	is($lei_out, "INBOX\nnope\nqp\nurgent\nx\n", 'ls-label shows qp');
+	is($lei_out, "inbox\nnope\nqp\nurgent\nx\n", 'ls-label shows qp');
+
+	lei_ok qw(q L:inbox);
+	is(json_utf8->decode($lei_out)->[0]->{blob},
+		$r2->[0]->{blob}, 'label search works');
+
+	ok(!lei(qw(tag -F eml t/utf8.eml +L:ALLCAPS)), '+L:ALLCAPS fails');
+	lei_ok(qw(ls-label));
+	is($lei_out, "inbox\nnope\nqp\nurgent\nx\n", 'ls-label unchanged');
 
 	if (0) { # TODO label+kw search w/ externals
 		lei_ok(qw(q L:qp), "mid:$mid", '--only', "$ro_home/t2");