基本正規表示式知識

#普通字元

import re
result = re.findall(
"p",
"python"
)print
(result)
result = re.findall(
"python"
,"i like python"
)print
(result)

#\d 匹配所有數字等同於0——9

result = re.findall(r"\d"
,"123456789abcdf"
)print
(result)
#\d 匹配所有的非數字   ^\d
result = re.findall(r"\d"
,"123456789abcdf"
)print
(result)
#\w 包括下劃線字元 a-z  a-z 0-9 和下劃線
result = re.findall(r"\w"
,"123456789_abcdf$%&"
)print
(result)

result = re.findall(r"\w"

,"123456789_abcdf$%&"
)print
(result)

result = re.findall(r"\s"

,"123 456  7\t89_abc\ndf$%&"
)print
(result)
#\s 取反
result = re.findall(r"\s"
,"123456789_abcdf$%&"
)print
(result)

result = re.findall(r"[123]"

,"123 456789abcdf$%&"
)print
(result)
result = re.findall(r"[12ab]"
,"123 456\n78\t9abcdf$%&"
)print
(result)
result = re.findall(r"[\d\s]"
,"123 456\n78\t9abcdf$%&"
)print
(result)

result = re.findall(r"[^\d\s]"

,"123 456\n78\t9abcdf$%&"
)print
(result)

result = re.findall(r"[1-7]"

,"123 456\n78\t9abcdf$%&"
)print
(result)
result = re.findall(r"[a-d]"
,"123 456\n78\t9abcdf$%&"
)print
(result)
result = re.findall(r"[1-7a-d_%&\s]"
,"123 456\n78\t9ab_cdf$%&"
)print
(result)

result = re.findall(r"a[abc]"

,"aaabacad"
)print
(result)
result = re.findall(r"a([abc])"
,"aaabacad"
)print
(result)

# result = re.findall(r"\d\d\d" ,"123456789abcdf")

# print(result)
result = re.findall(r"\d"
,"123456789abcdf"
)print
(result)

result = re.findall(r"\d"

,"123a45678b90abcdf"
)print
(result)
result = re.findall(r"\d"
,"1234567890abcdf"
)#預設貪婪模式匹配
print
(result)
result = re.findall(r"\d?"
,"1234567890abcdf"
)#非貪婪
print
(result)

result = re.findall(r"\d"

,"12a34567890b1666666661abcdf"
)#預設貪婪模式匹配
print
(result)

result = re.findall(r"\d?"

,"1234567890abcdf"
)print
(result)
result = re.findall(r"\w?"
,"1234567890abcdf"
)print
(result)

result = re.findall(r"\d+?"

,"1234567890abcdf"
)print
(result)
result = re.findall(r"\d+"
,"1234567890abcdf"
)print
(result)

result = re.findall(r"\d*"

,"1234567890abcdf"
)print
(result)

result = re.findall(r"\*"

,"1234*56789*0abcdf"
)print
(result)
result = re.findall(r"4\*5"
,"1234*56789*0abcdf"
)print
(result)
result = re.findall(r"4*5"
,"1234*567859*0abcdf"
)print
(result)

result = re.findall(r"d\w+d"

,"d******d***xxd"
)print
(result)
result = re.findall(r"d\w+?d"
,"d******d***xxd"
)print
(result)
htmlstr =
"python
$123
[email protected]"
result = re.findall(r".+"
,htmlstr)
print
(result)
result = re.findall(r".+?/td>"
,htmlstr)
print
(result)
result = re.findall(r"(.+?)"
,htmlstr)
print
(result)
#反向引用
wordstr =
"""'hello' "python" 'love" "haha'
"""result = re.findall(r"['\"]\w+['\"]"
,wordstr)
print
(result)
result = re.findall(r"('|\")(\w+)(\1)"
,wordstr)
print
(result)
print
([x[1]
for x in result]
)#校驗密碼 122223 111222 121212 123321
result = re.findall(r"(\d)(\1)"
,"111222"
)print
(result)
print
([x[1]
+x[0
]for x in result]
)

result = re.findall(r"\d"

,"137000000001232312"
)print
(result)

result = re.findall(r"^\d"

,"137000000001232312"
)print
(result)
result = re.findall(r"^\d$"
,"137000000001232312"
)#從開頭到結尾一共11個
print
(result)
result = re.findall(r"^\d$"
,"13700000000"
)print
(result)

正規表示式知識

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