-"""Basic regular expression demostration facility (Perl style syntax).
-
-This displays a window with two type-in boxes. In the top box, you
-enter a Perl style regular expression. In the bottom box, you enter a
-string. The first match in the string of the regular expression is
-highlighted with a yellow background (or red if the match is empty --
-then the character at the match is highlighted). The highlighting is
-continuously updated. At the bottom are a number of checkboxes which
-control the regular expression options used (see the re module for
-descriptions). When there's no match, or when the regular expression
-is syntactically incorrect, an error message is displayed.
-
-"""
+"""Basic regular expression demostration facility (Perl style syntax)."""
from Tkinter import *
import re