Control cursor

def ctrl_cursor(event):
    """Controls the cursor movement in Entry Box widgets when using Ctrl.
    Example: Ctrl + Left Arrow will move left until non-word character.
    Example: Ctrl + BackSpace will delete the last word.
    """
    cursor_pos = event.widget.index(INSERT)
    if event.widget.cget("show"):
        delete_range = (cursor_pos, END) if event.keysym == "BackSpace" else (END, cursor_pos)
        event.widget.delete(*delete_range)
        return
    idx = 0

    content = event.widget.get()
    if event.keysym == "BackSpace":
        match_word = re.search(r"\W\w*$", content[:cursor_pos])
        match_char = re.search(r"\W+$", content[:cursor_pos])

        if match_char:
            idx = match_char.start()
        elif match_word:
            idx = match_word.start() + 1

        event.widget.delete(idx, cursor_pos)

    elif event.keysym == "Delete":
        cursor_pos = event.widget.index(INSERT)

        match_word = re.search(r"^\w+", content[cursor_pos:])
        match_char = re.search(r"^\W+", content[cursor_pos:])

        if match_word:
            idx = len(content) - len(content[cursor_pos:]) + match_word.end()
        elif match_char:
            idx = len(content) - len(content[cursor_pos:]) + match_char.end()

        event.widget.delete(cursor_pos, idx)