import re 
# 
match_object = re.match('foo','foo') 
if match_object is not None: 
  print type(match_object) 
  print match_object.group() 
 
# 
match_object = re.match('foo','fooabv') 
if match_object is not None: 
  print match_object.group() 
  
#match从头开始匹配   
match_object = re.match('foo','afooabv') 
if match_object is not None: 
  print match_object.group() 
else: 
  print 'not match' 
   
#利用面向对象的特点，一行完成 
print re.match('love','lovesomebody is a happy thing').group() 
 
#与match的区别：match从头开始匹配，search是查找 
match_object = re.search('foo','afooabv') 
if match_object is not None: 
  print match_object.group() 
else: 
  print 'not match' 
   
#|的使用 
bt = 'bat|bit|bot' 
match_object = re.match(bt,'batsdf') 
if match_object is not None: 
  print "|...|" + match_object.group()#会匹配成功 
else: 
  print 'not match' 
   
bt = 'bat|bit|bot' 
match_object = re.search(bt,'aabatsdf') 
if match_object is not None: 
  print "|search|" + match_object.group()#会匹配成功，如果用match就不会匹配成功 
else: 
  print 'not match' 

<type '_sre.SRE_Match'>
foo
foo
not match
love
foo
|...|bat
|search|bat