Hi, here is a feedback for a "possible bug". I was trying to ft:mark with a "\s" wildcard. Hope I helped,
Version: BaseX 6.6.1 Java: Sun Microsystems Inc., 1.6.0_18 OS: Linux, i386 Stack Trace: java.lang.NegativeArraySizeException org.basex.util.ft.WesternTokenizer.orig(WesternTokenizer.java:201) org.basex.util.ft.WesternTokenizer.get(WesternTokenizer.java:187)
org.basex.util.ft.WesternTokenizer.nextToken(WesternTokenizer.java:113) org.basex.util.ft.FTLexer.nextToken(FTLexer.java:116) org.basex.query.ft.FTTokenizer.cache(FTTokenizer.java:105) org.basex.query.ft.FTWords.contains(FTWords.java:208) org.basex.query.ft.FTWords.item(FTWords.java:130) org.basex.query.ft.FTContains.item(FTContains.java:75) org.basex.query.ft.FTContains.item(FTContains.java:1) org.basex.query.expr.ParseExpr.ebv(ParseExpr.java:85) org.basex.query.expr.ParseExpr.test(ParseExpr.java:98) org.basex.query.expr.Preds.preds(Preds.java:99) org.basex.query.path.IterStep$1.next(IterStep.java:49) org.basex.query.iter.NodeIter.next(NodeIter.java:1) org.basex.query.path.IterPath$1.next(IterPath.java:67) org.basex.query.iter.NodeIter.next(NodeIter.java:1) org.basex.query.func.FNFt$1.next(FNFt.java:97) org.basex.query.iter.Iter.finish(Iter.java:65) org.basex.query.expr.ParseExpr.value(ParseExpr.java:76) org.basex.query.expr.Let$1.next(Let.java:94) org.basex.query.expr.FLWR$1.next(FLWR.java:62) org.basex.query.expr.Constr.<init>(Constr.java:55) org.basex.query.expr.CElem.item(CElem.java:116) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:52) org.basex.query.QueryContext.iter(QueryContext.java:329) org.basex.query.expr.Constr.<init>(Constr.java:54) org.basex.query.expr.CElem.item(CElem.java:116) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:52) org.basex.query.QueryContext.iter(QueryContext.java:329) org.basex.query.QueryContext.iter(QueryContext.java:294) org.basex.query.QueryContext.eval(QueryContext.java:254) org.basex.query.QueryProcessor.execute(QueryProcessor.java:113) org.basex.core.cmd.AQuery.query(AQuery.java:83) org.basex.core.cmd.XQuery.run(XQuery.java:22) org.basex.core.Command.run(Command.java:292) org.basex.core.Command.exec(Command.java:274) org.basex.core.Command.execute(Command.java:67) org.basex.gui.GUI.exec(GUI.java:390) org.basex.gui.GUI$5.run(GUI.java:351)