Is there a way to get the lines from a multi-line text field into an array - one array element per line? Each line in the text field ends with one delimiter character (say <CR> or ';'), but that character should not be part of the array element. So:
Multi-line text field:
This would be with Acrobat XI.
If the array created is used to populate other text fields, would that work under Adobe Reader?
Yes, it will work with Reader. There is a carriage return at the end of each line of a multiline text field, so you can just to this:
var aRows = getField("multiline1").valueAsString.split(/\r/);
But note that if one line wraps to another, there won't be a carriage return at what appears to be the end of the first line.