# -*- coding: cp936 -*-
import re 
s1 = 'adkkdk'
s2 = 'abc123efg'

an = re.search('^[a-z]+$', s1)
if an:
  print 's1:', an.group(), '全为小写' 
else:
  print s1, "不全是小写！"

an = re.match('[a-z]+$', s2)
if an:
  print 's2:', an.group(), '全为小写' 
else:
  print s2, "不全是小写！"

import re
a = "123abc456"
print re.search("([0-9]*)([a-z]*)([0-9]*)",a).group(0)  #123abc456,返回整体
print re.search("([0-9]*)([a-z]*)([0-9]*)",a).group(1)  #123
print re.search("([0-9]*)([a-z]*)([0-9]*)",a).group(2)  #abc
print re.search("([0-9]*)([a-z]*)([0-9]*)",a).group(3)  #456