moved match_pattern to utils

bot/utils.lua

@@ -438,3 +438,12 @@ function send_large_msg_callback(cb_extra, success, result)
     send_msg(destination, my_text, send_large_msg_callback, cb_extra)
   end
 end
+
+-- Returns a table with matches or nil
+function match_pattern(pattern, text)
+  local matches = { string.match(text, pattern) }
+  if next(matches) then
+    return matches
+  end
+  -- nil
+end