gtk:editable-chars (editable &key start end)

editable -- a gtk:editable object
start -- an integer for the start position, the default value is 0
end -- an integer for the end position, the default value is -1

The string for the contents of the editable widget.

Retrieves a sequence of characters. The characters that are retrieved are those characters at positions from start up to, but not including end. If end is negative, then the characters retrieved are those characters from start to the end of the text. Note that positions are specified in characters, not bytes.