python_re模块

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' ） 

正则表达式：http://www.regexlab.com/zh/regref.htm