Regular expression for different date formats in Python

Mon Nov 26 08:15:56 EST 2012

Hello Developers,
I am a beginner in python and need help with writing a regular expression for date and time to be fetched from some html documents. In the following code I am walking through the html files in a folder called event and printing the headings with h1 tag using beautifulsoup. These html pages also contains different formats of date and time. I want to fetch and display this information as well. Different formats of date in these html documents are:
21 - 27 Nov 2012
1 Dec 2012
30 Nov - 2 Dec 2012
26 Nov 2012
Can someone help me out with fetching these formats from these html documents ?
Here is my code for walking through the files and fetching h1 from those html files:
Code:

 import re
 import os
 from bs4 import BeautifulSoup

 for subdir, dirs, files in os.walk("/home/himanshu/event/"):
 for fle in files:
 path = os.path.join(subdir, fle) 
 soup = BeautifulSoup(open(path))

 print (soup.h1.string)

 #Date and Time detection