Started working on a chat filter, doesn't load from config yet, has example data

src/main/java/com/alttd/chat/util/Regex.java

@@ -0,0 +1,38 @@
+package com.alttd.chat.util;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Regex {
+
+    private static final HashMap<Pattern, ArrayList<String>> cancelRegex = new HashMap<>();
+    private static final HashMap<String, String> replaceRegex = new HashMap<>();
+
+    public static void initRegex() {
+        //TODO load data from config (a regex string, and it's exceptions if there are any)
+        cancelRegex.put(Pattern.compile("\\b([R]+[^\\w]?[4A]+[^\\w]?[P]+(([^\\w]?[E3]+[^\\w]?[DT]*)|([^\\w]?[I!1]+[^\\w]?[S5]+[^\\w]?[T7]+)|([^\\w]?[I!1]+[^\\w]?[N]+[^\\w]?[G69]+)))\\b"), new ArrayList<>());
+        //TODO load data from config (a regex string and what to replace it with)
+        replaceRegex.put(":pirate:", "pirate");
+    }
+
+    public static boolean violatesFilter(String text) {
+        for (Map.Entry<Pattern, ArrayList<String>> entry : cancelRegex.entrySet()) {
+            Matcher matcher = entry.getKey().matcher(text);
+            while (matcher.find()) {
+                if (!entry.getValue().contains(matcher.group())) return true;
+            }
+        }
+        return false;
+    }
+
+    public static String replaceText(String text) {
+        for (Map.Entry<String, String> entry : replaceRegex.entrySet()) {
+            text = text.replaceAll(entry.getKey(), entry.getValue());
+        }
+        return text;
+    }
+
+}