Shoutbox

Good day

I was wondering about making a simple emoticon replacing talker, however, your script recognizes emoticons not by its codes, but by something else.
My other prob that I was trying to replace the emoticons with some other characters, but I noticed that in some cases the replacement doesn't work, it even makes the script ignore the whole file (I tried to do it in txt, since I don't know anything about Java)

Working sample:

_DDDD       |d
_DDD         |c
_DD           |b
_D             |a

Not working sample:
_$              |a
_'((            |a

Could you fix the problems with the characters/emoticons?
Or at least list the invalid characters?

Thanks in advance:
YeTiKe

(the reason I tried to do it in a txt file is because it is easier to manage than Quick Texts)