at java.util.regex.Pattern.error(Pattern.java:1955) ~[?:1.8.0_77]
 at java.util.regex.Pattern.range(Pattern.java:2655) ~[?:1.8.0_77]
 at java.util.regex.Pattern.clazz(Pattern.java:2562) ~[?:1.8.0_77]
 at java.util.regex.Pattern.sequence(Pattern.java:2063) ~[?:1.8.0_77]
 at java.util.regex.Pattern.expr(Pattern.java:1996) ~[?:1.8.0_77]
 at java.util.regex.Pattern.compile(Pattern.java:1696) ~[?:1.8.0_77]
 at java.util.regex.Pattern.<init>(Pattern.java:1351) ~[?:1.8.0_77]
 at java.util.regex.Pattern.compile(Pattern.java:1054) ~[?:1.8.0_77]
 at com.forschat.advert.Core.checkForAD(Core.java:71) ~[?:?]
 at com.forschat.advert.EventListener.onChatEvent(EventListener.java:53) ~[?:?]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77]
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_77]
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_77]
 at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_77]
 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52]
 ... 11 more