re模块3

#分组 () 
print(re.findall("(ad)/(vv)","adddad/vvdddddddddd"))
print(re.findall("(ad)/(d)","ad/ddad/vvdddddddddd"))
print(re.findall("(a)(d)","adddad/vvdddddddddd"))  #分组中间要有个字母和特殊符号隔开
print(re.findall("(ad)/d(da)","ad/ddad/vvdddddddddd"))
print(re.search("(a)g(b)","adagbgdagbhagb").group())
print(re.findall("(a)g(b)","adagbgdagbh"))

ret = re.search("(?P<id>d{2}):(?P<name>w{2})","25:a5")
print(ret.group()) #25:a5
print(ret.group("id")) #25
print(ret.group("name")) #a5

print(re.search("a[bf]c","abcd").group()) #abc  字符串型
print(re.findall("a[bf]c","abcd")) #['abc']  列表型


# |
print(re.findall("a|b","afbgh"))   #['a', 'b']  需要匹配所有的a和b
print(re.search("a|b","gaafbghagdbg").group())  #a    只需要匹配所有的a和b
print(re.search("(ab)|f","gaabfbghagdbg").group()) #ab

print(re.search("d|gg","ds125ffgg").group())  #1

 findall，match，search区别

print(re.findall("f","ffffffffgdsaadfasda12gtre5y7u")) #['ffffffff', 'f']  #匹配全部
print(re.search("f","gfffgdsaadfasda12gtre5y7u").group()) #f  匹配一个
print(re.match("a","gabd").group()) #a  只在开头匹配如果开头没有就会报错 “NoneType” |  相当于在findall中的"^a"

print(re.split("[ab]","abcg"))  #['', '', 'cg']
print(re.split("[ab]","habg"))  #['h', '', 'g']

print(re.sub("d","abc","aa5mm6nn7ff"))   #第一个是最右边要替换的位置，中间是替换的内容
print("abcda".replace("a","kk",1))  #替换

print(re.sub("d","b","ab1cdb2cd"))

rets = re.compile("d{2}")  #编译
print(rets.search("av35ghd").group())

rett = re.finditer("d","a1n2nm5")

for i in rett:
    print(next(rett).group())

print(re.findall("www.(baidu|oldbaidu).com","www.baidu.com")) #['baidu']
#会先匹配结果组里面的内容先返回 ，如果要得到全部结果需要取消权限
print(re.findall("www.(?:baidu|oldbaidu).com","www.baidu.com"))  #['www.baidu.com']