diff --git a/libraries/cron.lua b/libraries/cron.lua
index 3c0d56a..a123112 100644
--- a/libraries/cron.lua
+++ b/libraries/cron.lua
@@ -9,6 +9,11 @@ The above copyright notice and this permission notice shall be included in all c
 THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 ]]
 
+local safe_regex = function(str,pattern)
+    local status,ret = pcall(string.match,str,pattern)
+    if status then return ret end
+end
+
 -- Adjustments for lua5.1
 if _VERSION=="Lua 5.1" then
     table.unpack = unpack
@@ -124,7 +129,7 @@ local predtypes = {
     end},
     {"^/([^/]*)/$","regex",function(regex)
         return function(input)
-            return (tostring(input):match(regex) ~= nil)
+            return (safe_regex(tostring(input),regex) ~= nil)
         end
     end},
     {"^\"([^\"]*)\"$","string",function(str)
diff --git a/plugins/cron/init.lua b/plugins/cron/init.lua
index f563508..a7b9f37 100644
--- a/plugins/cron/init.lua
+++ b/plugins/cron/init.lua
@@ -116,7 +116,7 @@ end
 local event = command("event",{
     help = {embed={
       title = "Add a cron event",
-      description = "Description coming soon",
+      description = "https://github.com/512mb-org/512mb.org-bot/wiki/Events-and-cronjobs",
       fields = {
         {name = "Usage:",value = "event ..."},
         {name = "Perms:",value = "administrator"},
diff --git a/plugins/security/init.lua b/plugins/security/init.lua
index 36fa3e6..0585e13 100644
--- a/plugins/security/init.lua
+++ b/plugins/security/init.lua
@@ -5,6 +5,11 @@ local plugin = pluginc("help")
 
 local db = sql.open(server.config_path.."sec.sqlite")
 
+local safe_regex = function(str,pattern)
+    local status,ret = pcall(string.match,str,pattern)
+    if status then return ret end
+end
+
 if not db:rowexec("SELECT name FROM sqlite_master WHERE type='table' AND name='infractions'") then
     db:exec [[
 CREATE TABLE infractions(id INTEGER PRIMARY KEY AUTOINCREMENT, user TEXT, desc TEXT, action TEXT, timestamp INTEGER);
@@ -65,11 +70,11 @@ local warn = command("warn",{
       description = "nuff said.",
       fields = {
         {name = "Usage:",value = "warn <user> <reason>"},
-        {name = "Perms:",value = "kick_members"},
+        {name = "Perms:",value = "kickMembers"},
       }
     }},
     perms = {
-        "kick_members"
+        "kickMembers"
     },
     args = {
         "member",
@@ -99,12 +104,12 @@ local infractions = command("infractions", {
         description = "Infractions include kicks, bans, mutes and warnings.",
         fields = {
             {name = "Usage: ", value = "infractions <user> [<startfrom>]"},
-            {name = "Perms: ", value = "kick_members"},
+            {name = "Perms: ", value = "kickMembers"},
             {name = "Options: ", value = "--type=(warn default,ban,kick)"}
         }
     }},
     perms = {
-        "kick_members"
+        "kickMembers"
     },
     args = {
         "member",
@@ -144,4 +149,66 @@ local infractions = command("infractions", {
 })
 plugin:add_command(infractions)
 
+local purge = command("purge",{
+    help = { embed = {
+        title = "Purge a number of messages",
+        description = "nuff said.",
+        fields = {
+            {name = "Usage: ", value = "purge <number>"},
+            {name = "Perms: ", value = "manageMessages"},
+            {name = "Options: ", value = "`--regex (regex)` - match content against regex; \n`--user (user)` - match user against id/name; \n`-w` - match webhook messages"}
+        }
+    }},
+    perms = {
+        "manageMessages"
+    },
+    args = {
+        "number"
+    },
+    exec = function(msg,args,opts)
+        local messages = {}
+        local messageCount = args[1]
+        local deletedMessageCount = 0
+        local last_id = nil
+        local matchfunc = function(v)
+            last_id = v.id
+            local matches = true
+            if opts["regex"] and (not (
+                (type(v.content) == "string") and
+                (safe_regex(v.content,opts["regex"])))) then
+                    matches = false
+            end
+            if opts["user"] and (not (
+                (v.author.id and (tostring(v.author.id) == opts["user"])) or
+                (v.author.name == opts["user"]))) then
+                    matches = false
+            end
+            if opts["w"] and (not v.webhookId) then
+                    matches = false
+            end
+            if matches then
+                table.insert(messages,v.id)
+                deletedMessageCount = deletedMessageCount + 1
+            end
+        end
+        local messages_fetched = msg.channel:getMessages(args[1]%100)
+        if messages_fetched then
+            messages_fetched:forEach(matchfunc)
+        end
+        msg.channel:bulkDelete(messages)
+        messageCount = messageCount-(args[1]%100)
+        while messageCount > 0 do
+            messages = {}
+            messages_fetched = msg.channel:getMessagesAfter(last_id,100)
+            if messages_fetched then
+                messages_fetched:forEach(matchfunc)
+            end
+            msg.channel:bulkDelete(messages)
+            messageCount = messageCount - 100
+        end
+        msg:reply("Deleted "..tostring(deletedMessageCount).." messages.")
+    end
+})
+plugin:add_command(purge)
+
 return plugin