"""
^ Matches the beginning of a line
$ Matches the end of the line
. Matches any character
\s Matches whitespace
\S Matches any non-whitespace character
* Repeats a character zero or more times
*? Repeats a character zero or more times (non-greedy)
+ Repeats a character one or more times
+? Repeats a character one or more times (non-greedy)
[aeiou] Matches a single character in the listed set
[^XYZ] Matches a single character not in the listed set
[a-z0-9] The set of characters can include a range
( Indicates where string extraction is to start
) Indicates where string extraction is to end
"""

import re

line = "From stephen.marquard@uct.ac.za Sat Jan  5 09:14:16 2008"
x = re.findall('@(\S+)', line)
print x

x = 'From: Using the : character'
y = re.findall('^F.+?:', x)
print y

line = "From stephen.marquard@uct.ac.za Sat Jan  5 09:14:16 2008"
x = re.findall('\S+?@\S+', line)
print x
