Python学习（三）——正则表达式模块

正则表达式入门：

http://www.cnblogs.com/deerchao/archive/2006/08/24/zhengzhe30fengzhongjiaocheng.html

re.match

match从字符串的开头进行匹配（注意是开头！！！）

text = "wensishuai is a handsome boy, he is cool, clever, and so on..."m = re.match(r'(w\w+)\s', text, re.I)if m:      print m.groups() else:      print 'not match'

返回的match object函数

re.search

search不必从开头进行匹配

返回值与match相同

re.findall

re.findall可以获取字符串中所有匹配的字符串。

text = "wensishuai is a handsome boy, he is cool, clever, and so on..."strlist = re.findall(r'\b(c\w+)\b', text, re.I)#strlist=['cool', 'clever']

re.sub

字符串替换

text = "Wensishuai is a handsome boy, he is cool, clever, and so on..."  newtext =  re.sub(r'\b(W\w*)\b', lambda m: '<' + m.group(0) + '>', text)

re.split

返回一个list

text = "Wensishuai     is a handsome boy, he is cool, clever, and so on..."  strlst = re.split(r'\s+', text)

re.complie

可以把正则表达式编译成一个正则表达式对象。可以把那些经常使用的正则表达式编译成正则表达式对象，这样可以提高一定的效率。下面是一个正则表达式对象的一个例子：

text = "JGood is a handsome boy, he is cool, clever, and so on..."  regex = re.compile(r'\w*oo\w*')  print regex.findall(text)  print regex.sub(lambda m: '[' + m.group(0) + ']', text)