+ YAZ_CHECK(tst_ccl_query(bibset, "title=?\\?",
+ "@attr 5=102 @attr 1=/my/title .*\\\\? "));
+
+ YAZ_CHECK(tst_ccl_query(bibset, "title=\"?\\?\"",
+ "@attr 5=102 @attr 1=/my/title \\\\?\\\\? "));
+
+ YAZ_CHECK(tst_ccl_query(bibset, "title=\\\\",
+ "@attr 5=102 @attr 1=/my/title \\\\\\\\ "));
+
+ YAZ_CHECK(tst_ccl_query(bibset, "\\\\",
+ "@attr 4=2 @attr 1=1016 \\\\ "));
+