正则表达式之match search findall finditer的用法

直接贴代码：
参考：http://cuiqingcai.com/977.html

# -*- coding:utf-8 -*- 
# 邮箱格式-正则表达式匹配 

import re  


def print_list(list):
for l in list:
print l
def findall_demo():
    txt = 'IF you 100 hahah $9.90'
# m = re.findall(r'(\d+).*\$(\d+\.?\d*)',txt)
    str1 = 'aaf [e-mail] asdf [e-mail] asdf [e-mail] asdf [e-mail] afdsaf'
    m = re.findall(r'\w*-*\.*\w*@\w+\.\w+',str1)
    print_list(m)

# match是从第一个字符开始匹配 匹配成功或不成功都结束 一个一个字符去匹配 知道匹配一模一样的就返回匹配的结果 并且结束 如果在从开头
# 往后匹配的过程中发现任何一个字符不匹配 结束匹配 返回None
def match_demo():
    regx = re.compile(r'aaf')
    str2 = 'aaafaaf [e-mail] asdf [e-mail] asdf [e-mail] asdf [e-mail] afdsaf'
    result_split = re.split(r' *',str2)
# print_list(result_split)
for result in result_split:
        m = re.match(r'\w*-*\.*\w*@\w+\.\w+',result)
if m:
            print(m.group())

# search方法与match方法极其类似，区别在于match()函数只检测re是不是在string的开始位置匹配，search()会扫描整个string查找匹配，
# match（）只有在0位置匹配成功的话才有返回，如果不是开始位置匹配成功的话，match()就返回None。
# 同样，search方法的返回对象同样match()返回对象的方法和属性。
# search匹配成功就结束
def search_demo():
    str3 = 'aaafaaf [e-mail] asdf [e-mail] asdf [e-mail] asdf [e-mail] afdsaf'
    result_split = re.split(r' *',str3)
    m = re.search(r'\w*-*\.*\w*@\w+\.\w+',str3)
for result in result_split:
        m = re.search(r'\w*-*\.*\w*@\w+\.\w+',result)
if m:
            print(m.group())
def finditer_demo():
    str3 = 'aaafaaf [e-mail] asdf [e-mail] asdf [e-mail] asdf [e-mail] afdsaf'
    m = re.finditer(r'\w*-*\.*\w*@\w+\.\w+',str3)
if m:
for result in m:
            print(result.group())



if __name__=='__main__':
    match_demo()
#
# for item in items:
# print item