[flexcoders] Newbie question: Removing text from textarea/disabling a character

[khan.ibraheem]

Hello,

I am using a textarea. I want to achieve 2 tasks:

1) Disable a particular character i.e. let suppose I dont want to
allow a certain character being shown(when it is typed) in the text area.

2) How can I remove some portion of the text from the textarea. I have
tried slice method but it hasnt worked.

Looking for help.

Thanks.