1. *表示匹配任意多个字符 \d*表示匹配任意多个数字字符
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import
re
text
=
"123h1ello world"
text1
=
"123Hello world456"
text2
=
"hello world"
res
=
re.match(
"\d*"
, text)
res1
=
re.match(
"\d*"
, text1)
res2
=
re.match(
"\d*"
, text2)
print
(res.group())
print
(res1.group())
print
(res2.group())
|
输出结果为
123
123Process finished with exit code 0
示例2：*
需求：匹配出，一个字符串第一个字母为大小字符，后面都是小写字母并且这些小写字母可有可无
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import
re
#注意是前一个字符
ret
=
re.match(
"[A-Z][a-z]*"
,
"M"
)
print
(ret.group())
ret
=
re.match(
"[A-Z][a-z]*"
,
"AaBcDE"
)
print
(ret.group())
ret
=
re.match(
"[A-Z][a-z]*"
,
"Aabcdef"
)
print
(ret.group())
|
#运行结果
M
Aa
Aabcdef
2. +表示匹配1个或者多个任意字符 \w+表示匹配一个或多个字母，数字或下划线
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import
re
text
=
"he+llo world"
text1
=
"Hello world456"
text2
=
"+hello world"
res
=
re.match(
"\w+"
, text)
res1
=
re.match(
"\w+"
, text1)
res2
=
re.match(
"\w+"
, text2)
print
(res.group())
print
(res1.group())
print
(res2)
|
输出结果为
he
Hello
NoneProcess finished with exit code 0
示例2：+
需求：匹配出，变量名是否有效
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import
re
names
=
[
"name1"
,
"_name"
,
"2_name"
,
"__name__"
]
for
i
in
names:
ret
=
re.match(
"[a-zA-Z_]+[\w]*"
,i)
if
ret:
print
(
"变量名 %s 符合要求"
%
ret.group())
else
:
print
(
"变量名 %s 非法"
%
i)
|
#运行结果
变量名 name1 符合要求
变量名 _name 符合要求
变量名 2_name 非法
变量名 __name__ 符合要求
3. ?表示匹配0个或一个字符 \w?表示匹配0或1个字母，数字或下划线
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import
re
text
=
"he+llo world"
text1
=
"Hello world456"
text2
=
"+hello world"
res
=
re.match(
"\w?"
, text)
res1
=
re.match(
"\w?"
, text1)
res2
=
re.match(
"\w?"
, text2)
print
(res.group())
print
(res1.group())
print
(res2.group())
|
输出结果为
h
HProcess finished with exit code 0
示例2：？
需求：匹配出0到99之间的数字
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import
re
ret
=
re.match(
"[1-9]?[0-9]"
,
"7"
)
print
(ret.group())
ret
=
re.match(
"[1-9]?\d"
,
"33"
)
print
(ret.group())
ret
=
re.match(
"[1-9]?\d"
,
"09"
)
print
(ret.group())
|
#运行结果
7
33
0 # 这个结果并不是想要的，利用$才能解决
4. {m}表示匹配m个字符 \d{11}表示匹配11个数字字符
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import
re
text
=
"he+llo world"
text1
=
"Hello world456"
text2
=
"hello world"
res
=
re.match(
"\w{2}"
, text)
res1
=
re.match(
"\w{3}"
, text1)
res2
=
re.match(
"\w{4}"
, text2)
print
(res.group())
print
(res1.group())
print
(res2.group())
|
输出结果为
he
Hel
hellProcess finished with exit code 0
示例2：{m}
需求：匹配出，8到20位的密码，可以是大小写英文字母、数字、下划线
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import
re
ret
=
re.match(
"[a-zA-Z0-9_]{6}"
,
"123a3g45678"
)
print
(ret.group())
ret
=
re.match(
"[[a-zA-Z0-9_]{8,20}"
,
"1ad3123456addfcasdef"
)
print
(ret.group())
|
#运行结果
123a3g
1ad3123456addfcasdef
5. {m,n}表示匹配m-n个字符 \w{2,4}表示匹配2-4个字符
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import
re
text
=
"hello world"
text1
=
"Helloworld456"
text2
=
"hello world"
res
=
re.match(
"\w{2,5}"
, text)
res1
=
re.match(
"\w{6,8}"
, text1)
res2
=
re.match(
"\w{20,25}"
, text2)
print
(res.group())
print
(res1.group())
print
(res2)
|
hello
Hellowor
NoneProcess finished with exit code 0
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