Fix regex matching email in host search (#3539)

Fixes #3528

server/datastore/mysql/mysql.go

@@ -802,7 +802,7 @@ func searchLike(sql string, params []interface{}, match string, columns ...strin
 // definitely not cut out any valid address is to just check for
 // the presence of @, which is arguably the most important check
 // in this.
-var rxLooseEmail = regexp.MustCompile(`^[^\s@]+@[^\s@\.]\..+$`)
+var rxLooseEmail = regexp.MustCompile(`^[^\s@]+@[^\s@\.]+\..+$`)
 
 func hostSearchLike(sql string, params []interface{}, match string, columns ...string) (string, []interface{}) {
 	base, args := searchLike(sql, params, match, columns...)

server/datastore/mysql/mysql_test.go

@@ -781,7 +781,7 @@ func TestNewUsesRegisterTLS(t *testing.T) {
 	require.Equal(t, "x509: certificate is not valid for any names, but wanted to match localhost", err.Error())
 }
 
-func TestWhereFilterTeas(t *testing.T) {
+func TestWhereFilterTeams(t *testing.T) {
 	t.Parallel()
 
 	testCases := []struct {
@@ -939,3 +939,24 @@ func TestCompareVersions(t *testing.T) {
 		})
 	}
 }
+
+func TestRxLooseEmail(t *testing.T) {
+	testCases := []struct {
+		str   string
+		match bool
+	}{
+		{"foo", false},
+		{"", false},
+		{"foo@example", false},
+		{"foo@example.com", true},
+		{"foo+bar@example.com", true},
+		{"foo.bar@example.com", true},
+		{"foo.bar@baz.example.com", true},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.str, func(t *testing.T) {
+			assert.Equal(t, tc.match, rxLooseEmail.MatchString(tc.str))
+		})
+	}
+}