Python 学习之正则表达式「下」

# 切割字符串

s = "To   be a better man !"

print(s.split(" "))
print(re.split(r" +", s))  # 以一个或多个空格切割

# re.finditer() 函数，与 findall() 类似，扫描整个字符串，返回的是一个迭代器，节省内存

s = "To be a better man! To be a better man! To be a better man!"

x = re.findall(r"(better)", s)
print(x)

i = re.finditer(r"(better)", s)  # 迭代器
while 1:
    try:
        j = next(i)
        print(j)
    except StopIteration as e:
        break

s = "To be a better better better man!"

print(re.sub(r"(better)", "great", s))
print(type(re.sub(r"(better)", "great", s)))

print(re.subn(r"(better)", "great", s, 2))
print(type(re.subn(r"(better)", "great", s)))

# 分组
phone = "010-8888888"
d = re.match(r"((\d{3})-(\d{7}))", phone)

# 使用序号获取对应组的信息，group(0) 代表原始字符串
print(d.group(0))

# 第一组
print(d.group(1))  # 010-8888888
print(d.group(2))  # 010
print(d.group(3))

# 查看匹配的各组的情况
print(d.groups())  # ('010-8888888', '010', '8888888')

pat= r"^1(([3578]\d)|(47))\d{8}$"

print(re.search(pat, "13588888888"))

# 编译成正则对象
phone = re.compile(pat)
print(phone.search("13588888888"))