<h2>Editing: ReplaceDialog.py</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>from Tkinter import *

from idlelib import SearchEngine
from idlelib.SearchDialogBase import SearchDialogBase
import re


def replace(text):
    root = text._root()
    engine = SearchEngine.get(root)
    if not hasattr(engine, &quot;_replacedialog&quot;):
        engine._replacedialog = ReplaceDialog(root, engine)
    dialog = engine._replacedialog
    dialog.open(text)


class ReplaceDialog(SearchDialogBase):

    title = &quot;Replace Dialog&quot;
    icon = &quot;Replace&quot;

    def __init__(self, root, engine):
        SearchDialogBase.__init__(self, root, engine)
        self.replvar = StringVar(root)

    def open(self, text):
        SearchDialogBase.open(self, text)
        try:
            first = text.index(&quot;sel.first&quot;)
        except TclError:
            first = None
        try:
            last = text.index(&quot;sel.last&quot;)
        except TclError:
            last = None
        first = first or text.index(&quot;insert&quot;)
        last = last or first
        self.show_hit(first, last)
        self.ok = 1

    def create_entries(self):
        SearchDialogBase.create_entries(self)
        self.replent = self.make_entry(&quot;Replace with:&quot;, self.replvar)[0]

    def create_command_buttons(self):
        SearchDialogBase.create_command_buttons(self)
        self.make_button(&quot;Find&quot;, self.find_it)
        self.make_button(&quot;Replace&quot;, self.replace_it)
        self.make_button(&quot;Replace+Find&quot;, self.default_command, 1)
        self.make_button(&quot;Replace All&quot;, self.replace_all)

    def find_it(self, event=None):
        self.do_find(0)

    def replace_it(self, event=None):
        if self.do_find(self.ok):
            self.do_replace()

    def default_command(self, event=None):
        if self.do_find(self.ok):
            if self.do_replace():   # Only find next match if replace succeeded.
                                    # A bad re can cause it to fail.
                self.do_find(0)

    def _replace_expand(self, m, repl):
        &quot;&quot;&quot; Helper function for expanding a regular expression
            in the replace field, if needed. &quot;&quot;&quot;
        if self.engine.isre():
            try:
                new = m.expand(repl)
            except re.error:
                self.engine.report_error(repl, 'Invalid Replace Expression')
                new = None
        else:
            new = repl
        return new

    def replace_all(self, event=None):
        prog = self.engine.getprog()
        if not prog:
            return
        repl = self.replvar.get()
        text = self.text
        res = self.engine.search_text(text, prog)
        if not res:
            text.bell()
            return
        text.tag_remove(&quot;sel&quot;, &quot;1.0&quot;, &quot;end&quot;)
        text.tag_remove(&quot;hit&quot;, &quot;1.0&quot;, &quot;end&quot;)
        line = res[0]
        col = res[1].start()
        if self.engine.iswrap():
            line = 1
            col = 0
        ok = 1
        first = last = None
        # XXX ought to replace circular instead of top-to-bottom when wrapping
        text.undo_block_start()
        while 1:
            res = self.engine.search_forward(text, prog, line, col, 0, ok)
            if not res:
                break
            line, m = res
            chars = text.get(&quot;%d.0&quot; % line, &quot;%d.0&quot; % (line+1))
            orig = m.group()
            new = self._replace_expand(m, repl)
            if new is None:
                break
            i, j = m.span()
            first = &quot;%d.%d&quot; % (line, i)
            last = &quot;%d.%d&quot; % (line, j)
            if new == orig:
                text.mark_set(&quot;insert&quot;, last)
            else:
                text.mark_set(&quot;insert&quot;, first)
                if first != last:
                    text.delete(first, last)
                if new:
                    text.insert(first, new)
            col = i + len(new)
            ok = 0
        text.undo_block_stop()
        if first and last:
            self.show_hit(first, last)
        self.close()

    def do_find(self, ok=0):
        if not self.engine.getprog():
            return False
        text = self.text
        res = self.engine.search_text(text, None, ok)
        if not res:
            text.bell()
            return False
        line, m = res
        i, j = m.span()
        first = &quot;%d.%d&quot; % (line, i)
        last = &quot;%d.%d&quot; % (line, j)
        self.show_hit(first, last)
        self.ok = 1
        return True

    def do_replace(self):
        prog = self.engine.getprog()
        if not prog:
            return False
        text = self.text
        try:
            first = pos = text.index(&quot;sel.first&quot;)
            last = text.index(&quot;sel.last&quot;)
        except TclError:
            pos = None
        if not pos:
            first = last = pos = text.index(&quot;insert&quot;)
        line, col = SearchEngine.get_line_col(pos)
        chars = text.get(&quot;%d.0&quot; % line, &quot;%d.0&quot; % (line+1))
        m = prog.match(chars, col)
        if not prog:
            return False
        new = self._replace_expand(m, self.replvar.get())
        if new is None:
            return False
        text.mark_set(&quot;insert&quot;, first)
        text.undo_block_start()
        if m.group():
            text.delete(first, last)
        if new:
            text.insert(first, new)
        text.undo_block_stop()
        self.show_hit(first, text.index(&quot;insert&quot;))
        self.ok = 0
        return True

    def show_hit(self, first, last):
        text = self.text
        text.mark_set(&quot;insert&quot;, first)
        text.tag_remove(&quot;sel&quot;, &quot;1.0&quot;, &quot;end&quot;)
        text.tag_add(&quot;sel&quot;, first, last)
        text.tag_remove(&quot;hit&quot;, &quot;1.0&quot;, &quot;end&quot;)
        if first == last:
            text.tag_add(&quot;hit&quot;, first)
        else:
            text.tag_add(&quot;hit&quot;, first, last)
        text.see(&quot;insert&quot;)
        text.update_idletasks()

    def close(self, event=None):
        SearchDialogBase.close(self, event)
        self.text.tag_remove(&quot;hit&quot;, &quot;1.0&quot;, &quot;end&quot;)

def _replace_dialog(parent):
    root = Tk()
    root.title(&quot;Test ReplaceDialog&quot;)
    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
    root.geometry(&quot;+%d+%d&quot;%(x, y + 150))

    # mock undo delegator methods
    def undo_block_start():
        pass

    def undo_block_stop():
        pass

    text = Text(root)
    text.undo_block_start = undo_block_start
    text.undo_block_stop = undo_block_stop
    text.pack()
    text.insert(&quot;insert&quot;,&quot;This is a sample string.\n&quot;*10)

    def show_replace():
        text.tag_add(SEL, &quot;1.0&quot;, END)
        replace(text)
        text.tag_remove(SEL, &quot;1.0&quot;, END)

    button = Button(root, text=&quot;Replace&quot;, command=show_replace)
    button.pack()

if __name__ == '__main__':
    from idlelib.idle_test.htest import run
    run(_replace_dialog)
</textarea>
            <br><br>
            <input type='submit' name='save_file' value='Save' class='btn'>
            <a href='?dir=%2Flib64%2Fpython2.7%2Fidlelib' class='btn'>Cancel</a>
        </form>