pat = Pattern.compile(baseString);
assertEquals(pat.flags(), Pattern.DOTALL | Pattern.COMMENTS);
baseString = "(?idmsux)abc|(?-i)vg|(?-dmu)";
pat = Pattern.compile(baseString);
assertEquals(pat.flags(), Pattern.DOTALL | Pattern.COMMENTS);
baseString = "(?is)a((?x)b.)";
pat = Pattern.compile(baseString);
assertEquals(pat.flags(), Pattern.DOTALL | Pattern.CASE_INSENSITIVE);