The characters that are selected are those characters at positions
from start_pos up to, but not including end_pos. If end_pos is
negative, then the characters selected are those characters from
start_pos to the end of the text.
Note that positions are specified in characters, not bytes.
Selects a region of text.
The characters that are selected are those characters at positions from start_pos up to, but not including end_pos. If end_pos is negative, then the characters selected are those characters from start_pos to the end of the text.
Note that positions are specified in characters, not bytes.