Why doesn't this substring work in Chinese? I'm getting the correct results for other languages but in Chinese I got an empty string.
    countryID = "奥地利(销售超过3万5千欧元)";
    countryID.substring(0, countryID.indexOf('(') - 1);
    countryID = "Austria (Sales > €35,000)";
    countryID.substring(0, countryID.indexOf('(') - 1);
 
     
     
    