Another Regex related issue where the is no regex involved?

//Error
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at Handlers.MessageHandler.handleCommand(MessageHandler.java:259)
    at Handlers.MessageHandler.<init>(MessageHandler.java:85)
    at Listeners.AnnotationListener.onMessageRecivedEvent(AnnotationListener.java:142)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sx.blah.discord.api.events.EventDispatcher.lambda$null$8(EventDispatcher.java:282)
    at java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:890)
    at sx.blah.discord.api.events.EventDispatcher.lambda$null$9(EventDispatcher.java:280)
    at java.util.concurrent.ConcurrentHashMap.forEach(ConcurrentHashMap.java:1597)
    at sx.blah.discord.api.events.EventDispatcher.lambda$null$10(EventDispatcher.java:279)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.concurrent.ConcurrentHashMap$EntrySpliterator.forEachRemaining(ConcurrentHashMap.java:3606)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at sx.blah.discord.api.events.EventDispatcher.lambda$dispatch$15(EventDispatcher.java:278)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.regex.PatternSyntaxException: Illegal repetition near index 6
#image#{Welcome_Icon.png}
      ^
    at java.util.regex.Pattern.error(Pattern.java:1955)
    at java.util.regex.Pattern.closure(Pattern.java:3157)
    at java.util.regex.Pattern.sequence(Pattern.java:2134)
    at java.util.regex.Pattern.expr(Pattern.java:1996)
    at java.util.regex.Pattern.compile(Pattern.java:1696)
    at java.util.regex.Pattern.<init>(Pattern.java:1351)
    at java.util.regex.Pattern.compile(Pattern.java:1028)
    at java.lang.String.split(String.java:2380)
    at java.lang.String.split(String.java:2422)
    at Handlers.InfoHandler.updateChannel(InfoHandler.java:55)
    at Handlers.InfoHandler.<init>(InfoHandler.java:31)
    at Handlers.MessageHandler.updateInfo(MessageHandler.java:686)
    ... 32 more

//Code
    private void updateChannel() {
       // Utility.deleteMessage(channel.getMessages());
        StringBuilder builder = new StringBuilder();
        for (String s: infoContents) {
            if (!s.startsWith("//")){
                builder.append(s + "\n");
            }
        }
        infoContents = new ArrayList<>(Arrays.asList(doTextTags(builder.toString()).split("\n")));
        builder.delete(0,builder.length());
        String imagePrefix = "#image#{";
        String imageSuffix = "}";
        String lastAttempt;
        for (String s: infoContents){
            if ((s + builder.toString()).length() > 2000){
                Utility.sendMessage(builder.toString(),channel);
            }
            if (s.contains(imagePrefix)){
                do {
                    lastAttempt = s;
                    String image = StringUtils.substringBetween(s,imagePrefix,imageSuffix);
                    String contentsToSend = s.split(imagePrefix + image + imageSuffix)[0];  //error occurs here...
                    if (contentsToSend != null || !contentsToSend.equals("")){
                        builder.append(contentsToSend);
                    }
                    Utility.sendMessage(builder.toString(),channel);
                    s = s.replace(contentsToSend + imagePrefix + image + imageSuffix,"");
                    Utility.sendFile("",channel,new File(Utility.getGuildImageDir(guild.getID())+ image));
                }while (s.contains(imagePrefix) && !lastAttempt.equals(s));
            }
        }
    }

//content trying to parse
"#image#{Welcome_Icon.png}
#image#{Welcome_Message.png}
We are a fairly new Discord for a fairly old community and as such
the admins here try our hardest to make this Discord the best it
can be so we hope that you enjoy your stay here."