Limiting Smiley

[bugsmafia]

Hello Help please. It hurts flood smilies in the chat.
How to limit the maximum number of smileys in a message?
For example: If you put in a single message * sm * * sm * * sm * * sm * * sm * it should print 5 images, but you need to limit to 3. The remaining 2 (* sm *) must be erased (not displayed). How do Prompt please.

Sorry for bad English. (Если есть Русские пользователи буду рад/If you have Russian users will be happy)