6.re正则表达式

 import re
 import unicodedata

 s = "a00xoghasalexjkdfldhfjk"
 v = s.find("alex")
 print(v)

 k = ""
 # 正则模糊匹配

 # print(re.findall("alex", s))
 # #  .是通配符（除了换行之外）
 # print(re.findall("a..x", s))
 # #  ^ （开头）和 $（结尾）
 # print(re.findall("^a..x", s))
 # print(re.findall("h..k$", s))
 # #  * (0-max) ；+(1,max) ； ?  （0，1）  贪婪匹配
 # b = "ccsrwrfdddddddddddkokosadkfod"
 # print(re.findall("d*", b))
 # print(re.findall("d+", b))
 # print(re.findall("alex*", "asdhfale"))  # 0-无穷大个
 # print(re.findall("alex+", "asdhfale"))  # 1-无穷大
 # print(re.findall("alex?", "asdhfalex"))  # 0-1个
 # print(re.findall("alex?", "asdhfale"))  # 0-1个
 #
 # # {}0-无穷大个 == * ; {1,} == + ; {6} 6次
 # # {} 可以带贪婪匹配
 # print(re.findall("alex{1,4}", "asdhfalexxx"))  # 1-4个
 # print(re.findall("alex{6}", "asdhfalexxx"))  # 必须是6个
 # # ? 惰性匹配
 # print(re.findall("alex*?", "asdhfalexxx"))
 # print(re.findall("alex+?", "asdhfalexxx"))
 #
 # # []字符集  中没有特殊符号（除了\-^）
 # print(re.findall("www[oldboy baidu]", "wwwbaidu"))
 # print(re.findall("x[ys]", "xyyszz"))
 # print(re.findall("s[zby]a", "xyyszasya"))
 # print(re.findall("s[zb,]a", "xyyszas,a"))
 #
 # print(re.findall("s[zb,]a", "xyyszas,a"))
 # print(re.findall("s[zb*]a", "xyyscas,a"))
 #
 # # -之间
 # print(re.findall("s[a-z]*", "sqaaaaerqwr"))
 # print(re.findall("s[a-z]*", "sqaaaaerqwr9"))  # [a-z] 之间
 #
 # print(re.findall("s[0-9]*", "s9qaaaaerqwr9"))  # [a-z] 之间
 # # ^非
 # print(re.findall("s[^a-z]", "sqaaaaerqwr9"))  # [a-z] 之间
 # # \转义
 # print(re.findall("\([^()]*\)", "12*(34*6+2-5*(2-1))"))
 # print(re.findall("\([^()]+\)", "12*(34*6+2-5*(2-1))"))
 #
 # # \d 【0-9】的数值
 # print(re.findall("\d+", "12*(34*6+2-5*(2-1))"))  # [0-9]
 # print(re.findall("\D+", "12*(34*6+2-5*(2-1))"))  # [^0-9]
 # print(re.findall("\s+", "hello world"), "ssss")  # \t\n\r\f\v 任何空白符
 # print(re.findall("\S+", "hello world"))  # [^\t\n\r\f\v]
 # print(re.findall("\w+", "hello world"))  # [0-9a-zA-Z_]
 # print(re.findall("\W", "hello world"))  # [^0-9a-zA-Z_]
 # print(re.findall("\b", "hello world")) # 空格，&，#
 #
 # print(re.findall(r"I\b", "hello I am world"))  #
 # print(re.findall("I\\b", "hello I am world"))  #
 #

 # print(re.findall("c\\\f", r"abcde\fgh"))
 # # | 或
 # print(re.findall("gh|f", "abcde|fgh"))
 # # () 分组
 # print(re.findall("(abf)*", r"abfabfabfh"))
 #
 # print(re.findall("(?P<name>\w+)", r"abfabfabfh"))
 #
 # #  search 找到第一个就返回一个对象(需要用group取出),，findall找到所有满足的结果放入列表
 #
 # print(re.search("\d+","23414afdfasf324fa"))
 # print(re.search("\d+","23414afdfasf324fa").group())
 # # 分组命名
 # print(re.search("(?P<name>[a-z]+)(?P<age>\d+)","23414alex324fa").group("name","age"))
 #
 # # match 成功返回对象，失败啥也不返回
 # print(re.match("\d+", "24dsd143f"))
 #
 # # split 分割
 # print(re.split(" ", "hello abc asf"))
 # print(re.split("[ |]", "hello abc|asf"))
 # print(re.split("[ab]", "hebllo abc|asf"))
 # # ["he","llo abc|asf"]->["he",“llo ","bc|asf"]->
 # # ["he","llo "," ","c|asf"]->["he","llo "," ","c|","sf"],
 # print(re.split("[ab]", "abc"))
 # # 替换
 # print(re.sub("\d+","A","dsfaf123aasf42112dfa"))
 #
 # print(re.subn("\d+","A","dsfaf123aasf42112dfa"))
 #
 # # 规则，书写规则
 # com = re.compile("\d+")
 # str1 = "qfaqs234rer1344"
 # print(com.findall(str1))
 #
 # com = re.compile("\d")
 # print(com.findall(str1))
 # # 迭代器
 # ite = com.finditer(str1)
 # # next(ite)
 # print(ite)
 # # ?: 去除优先级
 # print(re.findall("www\.(baidu|163)\.com","www.163.com"))  # 163
 # print(re.findall("www\.(?:baidu|163)\.com","www.163.com")) # www.163.com

# print(re.search("abc|bcd", "abc"))  # search
# print(re.search("a(bc)|bcd", "abc").group())
# "\(9[^()]+\)"

print(re.findall("(abc)+", "abcabcabc"))  # 给整体添加匹配
print(re.findall("abc+", "abcccabcabcfadfabc"))  # ?:去除优先级,给c添加重复匹配