@Test
    void backslashCanBeEscaped() {
        // Java escaping on top of YQL escaping, to produce a regexp with a single backslash
        assertParse("select * from sources * where artist matches 'a\\\\.'", "RegExpItem [expression=a\\.]");
    }
Specification for the conversion of YQL+ expressions to Vespa search queries.

@author Steinar Knutsen
@author Stian Kristoffersen
container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java