python正则表达式练习题

1. 匹配以hello开头的字符串。

import re

pattern = "^hello"
string = "hello world"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

2. 匹配以world结尾的字符串。

import re

pattern = "world$"
string = "hello world"
result = re.search(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

3. 匹配包含数字的字符串。

import re

pattern = "\d+"
string = "abc123def456"
result = re.findall(pattern, string)
print(result)

4. 匹配只包含数字的字符串。

import re

pattern = "^\d+$"
string = "123456"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

5. 匹配包含字母和数字的字符串。

import re

pattern = "[a-zA-Z0-9]+"
string = "abc123def456"
result = re.findall(pattern, string)
print(result)

6. 匹配只包含字母和数字的字符串。

import re

pattern = "^[a-zA-Z0-9]+$"
string = "abc123"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

7. 匹配包含特殊字符的字符串。

import re

pattern = "[^a-zA-Z0-9\s]+"
string = "abc!@#def$%^"
result = re.findall(pattern, string)
print(result)

8. 匹配只包含特殊字符的字符串。

import re

pattern = "^[^a-zA-Z0-9\s]+$"
string = "!@#$%^&*()"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

9. 匹配邮箱地址。

import re

pattern = "^\w+@\w+\.\w+$"
string = "example@gmail.com"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")

10. 匹配手机号码。

import re

pattern = "^1[3-9]\d{9}$"
string = "13812345678"
result = re.match(pattern, string)
if result:
    print("Matched")
else:
    print("Not matched")