apostrophe not considered with tkinter's wordstart and wordend

[ravas]

We resolved it over at the comp.lang.tcl group.
It turns out what Christian suggested affects what is selected when you double click a word. He later discovered a different method for producing what I want.
Below is my test code that implements both of these things
(tested with Python 3.4 and PyCharm).

import tkinter
import tkinter.messagebox as messagebox

class Creator(object):

    def __init__(self):

        root = self.root = tkinter.Tk()
       
        # Main Frame
        f_main = tkinter.Frame(root, borderwidth=6, relief='flat')
        f_main.grid(row=0, column=0, sticky='nsew')

        # Text widget, its font and frame
        f_txt = tkinter.Frame(f_main, borderwidth=2, relief="sunken")
        f_txt.config(width=768, height=768)

        f_txt.grid_propagate(False)  # ensures a consistent GUI size
        f_txt.pack(padx=4, pady=4, side="bottom", fill="both", expand=True)

        my_txt = tkinter.Text(f_txt, name='t')
        my_txt.config(undo=True, wrap='word')
        my_txt.grid(row=0, column=0, sticky="nsew")
        self.text = my_txt

        # Scrollbar and config
        f_scroll = tkinter.Frame(root, borderwidth=4, relief="groove")
        f_scroll.grid(row=0, column=1, sticky='nsew')
        scrollbar = tkinter.Scrollbar(f_scroll, command=my_txt.yview)
        scrollbar.pack(side='left', fill='y', pady=2, padx=0, expand=True)

        my_txt.config(yscrollcommand=scrollbar.set)
        scrollbar.columnconfigure(0, weight=1)

        # Stretchable
        root.columnconfigure(0, weight=1)
        root.rowconfigure(0, weight=1)
        f_main.columnconfigure(0, weight=1)
        f_main.rowconfigure(0, weight=1)
        f_txt.rowconfigure(0, weight=1)
        f_txt.columnconfigure(0, weight=1)

        my_txt.bind("<ButtonRelease-3>", self.test)
        my_txt.focus_set()

    def test(self, event=None):
        txt = str(self.text)
        a = "::tk::TextPrevPos {} current tcl_wordBreakBefore".format(txt)
        b = "::tk::TextNextPos {} current tcl_wordBreakAfter".format(txt)
        ind1 = self.root.tk.eval(a)
        ind2 = self.root.tk.eval(b)
        x = self.text.get(ind1, ind2)
        messagebox.showinfo('info', x)

# ===========================================================================
# start up
# ===========================================================================

GUI = Creator()
GUI.root.tk.eval("catch {tcl_endOfWord}")
GUI.root.tk.eval("catch {tcl_startOfPreviousWord}")
GUI.root.tk.eval("set tcl_wordchars {[[:alnum:]']}")
GUI.root.tk.eval("set tcl_nonwordchars {[^[:alnum:]']}")
GUI.root.mainloop()