Simple Methord to stop CRLF in textArea

Hi
i want to dibble the user from typing in CRLF, I want the text area to stay as 3 lines with no score bars

one approach is to the text types with an event activityinput.addEventListener(TextEvent.TEXT_INPUT,texteinput);

but i can not see to find a method to check for the \r

i.e. if(e.target.text == "\r") does not work

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