import re
pattern = re.compile(r'\d+')
s = pattern.search('hello 123456 789')
print(s.group())
s = pattern.findall('hello 13456 789')
print(s)
# str = 'I love You!'
# def daoxuprint(str):
# i = len(str)-1
# while i >= 0:
# print(str[i],end='')
# i -= 1
# #方法二
# pattern = re.compile(r'.')
# s = pattern.findall(str)
# print(s)
# for item in s:
# # print(item)
# daoxuprint('love')
#举例2 I love You
# pattern = re.compile(r'(\w+)(!?)')
# s = pattern.findall(str)
# print(s,type(s))
# for item in s:
# for i in item:
# if i == '':
# daoxuprint(' ')
# else:
# daoxuprint(i)
# #\. 是刚需必须有 d+ 必须一个或多个数字
# pattern = re.compile(r'\d+\.\d*')
#
# d = pattern.findall('3.141592653 PI 100 10001.11 3. .8 0.9')
# print(d)
