diff --git a/ConfigItem/EntityList.cs b/ConfigItem/EntityList.cs
index 22459ad..76bd0a5 100644
--- a/ConfigItem/EntityList.cs
+++ b/ConfigItem/EntityList.cs
@@ -1,4 +1,5 @@
-using Newtonsoft.Json.Linq;
+using Discord.WebSocket;
+using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -63,6 +64,67 @@ namespace Noikoio.RegexBot.ConfigItem
                 + $"{Users.Count()} user(s)";
         }
 
+        /// <summary>
+        /// Checks if the parameters of the given <see cref="SocketMessage"/> match with the entities
+        /// specified in this list.
+        /// </summary>
+        /// <param name="msg">An incoming message.</param>
+        /// <returns>
+        /// True if the <see cref="SocketMessage"/> occurred within a channel specified in this list,
+        /// or if the message author belongs to one or more roles in this list, or if the user itself
+        /// is defined within this list.
+        /// </returns>
+        public bool ExistsInList(SocketMessage msg)
+        {
+            var guildauthor = msg.Author as SocketGuildUser;
+            foreach (var item in this.Users)
+            {
+                if (!item.Id.HasValue)
+                {
+                    if (guildauthor != null &&
+                        string.Equals(item.Name, guildauthor.Nickname, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return true;
+                    }
+
+                    if (string.Equals(item.Name, msg.Author.Username, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return true;
+                    }
+                }
+                else
+                {
+                    if (item.Id.Value == msg.Author.Id) return true;
+                }
+            }
+
+            if (guildauthor != null)
+            {
+                foreach (var guildrole in guildauthor.Roles)
+                {
+                    if (this.Roles.Any(listrole =>
+                    {
+                        if (listrole.Id.HasValue) return listrole.Id == guildrole.Id;
+                        else return string.Equals(listrole.Name, guildrole.Name, StringComparison.OrdinalIgnoreCase);
+                    }))
+                    {
+                        return true;
+                    }
+                }
+
+                foreach (var listchannel in this.Channels)
+                {
+                    if (listchannel.Id.HasValue && listchannel.Id == msg.Channel.Id ||
+                        string.Equals(listchannel.Name, msg.Channel.Name, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return true;
+                    }
+                }
+            }
+
+            // No match.
+            return false;
+        }
 
         /// <summary>
         /// Helper method for reading whitelist and blacklist filtering lists
diff --git a/Feature/ModTools/CommandListener.cs b/Feature/ModTools/CommandListener.cs
index d0aa9af..687511d 100644
--- a/Feature/ModTools/CommandListener.cs
+++ b/Feature/ModTools/CommandListener.cs
@@ -35,8 +35,7 @@ namespace Noikoio.RegexBot.Feature.ModTools
             if (sc == null) return;
 
             // Disregard if not a bot moderator
-            // TODO have this and RegexResponder call the same relevant code
-            if (!IsInList(sc.Moderators, arg)) return;
+            if (!sc.Moderators.ExistsInList(arg)) return;
 
             // Disregard if the message contains a newline character
             if (arg.Content.Contains("\n")) return;
@@ -109,69 +108,5 @@ namespace Noikoio.RegexBot.Feature.ModTools
         }
 
         public new Task Log(string text) => base.Log(text);
-
-        private bool IsInList(EntityList ignorelist, SocketMessage m)
-        {
-            if (ignorelist == null)
-            {
-                // This happens when getting a message from a server not defined in config.
-                return false;
-            }
-
-            var author = m.Author as SocketGuildUser;
-            foreach (var item in ignorelist.Users)
-            {
-                if (!item.Id.HasValue)
-                {
-                    // Attempt to update ID if given nick matches
-                    if (string.Equals(item.Name, author.Nickname, StringComparison.OrdinalIgnoreCase)
-                        || string.Equals(item.Name, author.Username, StringComparison.OrdinalIgnoreCase))
-                    {
-                        return true;
-                    }
-                }
-                else
-                {
-                    if (item.Id.Value == author.Id) return true;
-                }
-            }
-
-            foreach (var item in ignorelist.Roles)
-            {
-                if (!item.Id.HasValue)
-                {
-                    // Try to update ID if none exists
-                    foreach (var role in author.Roles)
-                    {
-                        if (string.Equals(item.Name, role.Name, StringComparison.OrdinalIgnoreCase))
-                        {
-                            return true;
-                        }
-                    }
-                }
-                else
-                {
-                    if (author.Roles.Any(r => r.Id == item.Id)) return true;
-                }
-            }
-
-            foreach (var item in ignorelist.Channels)
-            {
-                if (!item.Id.HasValue)
-                {
-                    // Try get ID
-                    if (string.Equals(item.Name, m.Channel.Name, StringComparison.OrdinalIgnoreCase))
-                    {
-                        return true;
-                    }
-                }
-                else
-                {
-                    if (item.Id == m.Channel.Id) return true;
-                }
-            }
-
-            return false;
-        }
     }
 }
diff --git a/Feature/RegexResponder/EventProcessor.cs b/Feature/RegexResponder/EventProcessor.cs
index 7e498ea..75d0af2 100644
--- a/Feature/RegexResponder/EventProcessor.cs
+++ b/Feature/RegexResponder/EventProcessor.cs
@@ -1,13 +1,12 @@
 using Discord;
 using Discord.WebSocket;
+using Newtonsoft.Json.Linq;
 using Noikoio.RegexBot.ConfigItem;
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using Newtonsoft.Json.Linq;
 
 namespace Noikoio.RegexBot.Feature.RegexResponder
 {
@@ -127,7 +126,7 @@ namespace Noikoio.RegexBot.Feature.RegexResponder
             if (rule.MaxLength.HasValue && msgcontent.Length >= rule.MaxLength.Value) return;
 
             // Moderator bypass check
-            if (rule.AllowModBypass == true && IsInList(srv.Moderators, msg)) return;
+            if (rule.AllowModBypass == true && srv.Moderators.ExistsInList(msg)) return;
             // Individual rule filtering check
             if (IsFiltered(rule, msg)) return;
 
@@ -226,79 +225,22 @@ namespace Noikoio.RegexBot.Feature.RegexResponder
         {
             if (r.FilterMode == FilterType.None) return false;
 
-            bool inFilter = IsInList(r.FilterList, m);
+            bool inFilter = r.FilterList.ExistsInList(m);
             
             if (r.FilterMode == FilterType.Whitelist)
             {
                 if (!inFilter) return true;
-                return IsInList(r.FilterExemptions, m);
+                return r.FilterExemptions.ExistsInList(m);
             }
             else if (r.FilterMode == FilterType.Blacklist)
             {
                 if (!inFilter) return false;
-                return !IsInList(r.FilterExemptions, m);
+                return !r.FilterExemptions.ExistsInList(m);
             }
 
             return false; // this shouldn't happen™
         }
 
-        private bool IsInList(EntityList ignorelist, SocketMessage m)
-        {
-            if (ignorelist == null)
-            {
-                // This happens when getting a message from a server not defined in config.
-                return false;
-            }
-
-            var guildauthor = m.Author as SocketGuildUser;
-            foreach (var item in ignorelist.Users)
-            {
-                if (!item.Id.HasValue)
-                {
-                    if (guildauthor != null &&
-                        string.Equals(item.Name, guildauthor.Nickname, StringComparison.OrdinalIgnoreCase))
-                    {
-                        return true;
-                    }
-                    
-                    if (string.Equals(item.Name, m.Author.Username, StringComparison.OrdinalIgnoreCase))
-                    {
-                        return true;
-                    }
-                } else
-                {
-                    if (item.Id.Value == m.Author.Id) return true;
-                }
-            }
-
-            if (guildauthor != null)
-            {
-                foreach (var guildrole in guildauthor.Roles)
-                {
-                    if (ignorelist.Roles.Any(listrole =>
-                    {
-                        if (listrole.Id.HasValue) return listrole.Id == guildrole.Id;
-                        else return string.Equals(listrole.Name, guildrole.Name, StringComparison.OrdinalIgnoreCase);
-                    }))
-                    {
-                        return true;
-                    }
-                }
-
-                foreach (var listchannel in ignorelist.Channels)
-                {
-                    if (listchannel.Id.HasValue && listchannel.Id == m.Channel.Id ||
-                        string.Equals(listchannel.Name, m.Channel.Name, StringComparison.OrdinalIgnoreCase))
-                    {
-                        return true;
-                    }
-                }
-            }
-
-            // No match.
-            return false;
-        }
-
         private string[] SplitParams(string cmd, int? limit = null)
         {
             if (limit.HasValue)