帝王谷资源网 Design By www.wdxyy.com

1.  *表示匹配任意多个字符   \d*表示匹配任意多个数字字符

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
123

Process 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

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

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
None

Process finished with exit code 0

示例2:+

需求:匹配出,变量名是否有效

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.  "htmlcode">
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
H

Process finished with exit code 0

示例2:?

需求:匹配出0到99之间的数字

import re

ret = re.match("[1-9]","7")
print(ret.group())

ret = re.match("[1-9]","33")
print(ret.group())

ret = re.match("[1-9]","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

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
hell

Process 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

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

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
None

Process finished with exit code 0

标签:
python,re.match()匹配字符,python,re.match()

帝王谷资源网 Design By www.wdxyy.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
帝王谷资源网 Design By www.wdxyy.com