正则-- | 单个字符匹配

# ### 正则表达式
# findall 匹配字符串中相应内容, 返回列表
import re
'''
lst = re.findall(正则表达式,要匹配的字符串)
'''


'''
d 匹配数字
D 匹配非数字
'''
lst = re.findall("d","sadfsdfsa 98&*^&^&92sdf3sdf839 sdf_as 神秘男孩 89")
print(lst)
lst = re.findall("D","sadfsdfsa 98&*^&^&92sdf3sdf839 sdf_as 神秘卫星 89")
print(lst)

"""
w 字母,数字,下划线,包含中文(正则函数当中支持中文的匹配)
W 匹配非字母或数字或下划线
"""
lst = re.findall("w","09090sdf909sdf_+()()&*&*%^%^你好sd")
print(lst)
lst = re.findall("W","09090sdf909sdf_+()()&*&*%^%^你好sd")
print(lst)

"""
s 匹配任意空白符
S 匹配任意非空白符
"""
strvar = """
"""

lst = re.findall("s","       			")
print(lst)
lst = re.findall("s",strvar)
print(lst)
lst = re.findall("S","   	lklkl sdfsdf sdfsdf")
print(lst)

"""

 匹配换行
	 匹配一个制表符
"""
strvar = """
今天	拉     肚										子
"""
lst = re.findall(r"
",strvar)
print(lst)
lst = re.findall(r"	",strvar)
print(lst)


# ###字符组练习 必须从字符组选一个,如果一个都没有则匹配不成功
lst = re.findall("[123]","s3dafsf2s1")
print(lst)
print(re.findall('a[abc]b','aab abb acb adb'))


print(re.findall('a[0123456789]b','a1b a2b a3b acb ayb a9090909009b'))
# 优化版:0123456789 => 0-9 等价
print(re.findall('a[0-9]b','a1b a2b a3b acb ayb a9090909009b'))


print(re.findall('a[abcdefg]b','a1b a2b a3b acb ayb adb aabababbababb')) #['acb', 'adb']
# 优化版:a b c d .... z  => a-z
print(re.findall('a[a-g]b','a1b a2b a3b acb ayb adb aabababbababb')) 
print(re.findall('a[a-z]b','a1b a2b a3b acb ayb adb aabababbababb')) 


print(re.findall('a[ABCDEFG]b','a1b a2b a3b  aAb aDb aYb'))
# 优化版: A B C ... Z => A-Z
print(re.findall('a[A-G]b','a1b a2b a3b  aAb aDb aYb'))
print(re.findall('a[A-Z]b','a1b a2b a3b  aAb aDb aYb'))


print(re.findall('a[0-9a-zA-Z]b','a-b aab aAb aWb aqba1b')) 
# 优化版: a-zA-Z => A-z 可以匹配所有大小写,但是有缺陷,一些特殊符号也匹配到了
print(re.findall('[A-z]','('))
print(re.findall('[0-z]','9')) # 语法上允许,但是别这么用,没意义

print(re.findall('a[0-9][*#/]b','a1/b a2b a29b a56b a456bab'))
# ^ 字符组中的^ 代表除了的意思 
print(re.findall('a[^-+*/]b',"a%b ccaa*bda&bd"))

# 单独匹配一个特殊字符,用让他的意思失效 转义字符
print(re.findall('a[^]b',"a^b"))