正则表达式实战案例：通俗易懂，轻松入门！</#>

2023-02-22 17:24:32

正则表达式入门宝典：用代码驾驭字符串的力量

正则表达式简介
实战案例：手机号匹配
实战案例：手机号中间四位替换
实战案例：体温匹配
实战案例：格式化数字
实战案例：格式化金额
实战案例：密码强度验证
常见问题解答

正则表达式简介

正则表达式（Regular Expression）是一种用于匹配、搜索和操作字符串的强大工具，在编程和数据处理领域广泛使用。它能够帮助你快速查找、提取、替换或验证字符串中的特定内容。

实战案例：手机号匹配

# 匹配中国大陆手机号
import re

phone_number = "13912345678"
pattern = "^(1[3-9]\d{9})# 匹配中国大陆手机号
import re

phone_number = "13912345678"
pattern = "^(1[3-9]\d{9})$"

match = re.match(pattern, phone_number)

if match:
    print("手机号有效")
else:
    print("手机号无效")
quot;

match = re.match(pattern, phone_number)

if match:
    print("手机号有效")
else:
    print("手机号无效")

实战案例：手机号中间四位替换

# 匹配手机号中间四位并替换为星号
import re

phone_number = "13912345678"
pattern = "^(1[3-9]\d{2})\d{4}([6-9]\d{3})# 匹配手机号中间四位并替换为星号
import re

phone_number = "13912345678"
pattern = "^(1[3-9]\d{2})\d{4}([6-9]\d{3})$"
replacement = "\g<1>**** \g<2>"

masked_phone_number = re.sub(pattern, replacement, phone_number)

print(masked_phone_number)  # 输出：1391234**** 678
quot;
replacement = "\g<1>**** \g<2>"

masked_phone_number = re.sub(pattern, replacement, phone_number)

print(masked_phone_number)  # 输出：1391234**** 678

实战案例：体温匹配

# 匹配体温数据
import re

temperature = "37.5℃"
pattern = "^(([3][5-9]\.[0-9])|([3][6-7]\.[0-9])|([3][8]\.[0-5]))℃# 匹配体温数据
import re

temperature = "37.5℃"
pattern = "^(([3][5-9]\.[0-9])|([3][6-7]\.[0-9])|([3][8]\.[0-5]))℃$"

match = re.match(pattern, temperature)

if match:
    print("体温有效")
else:
    print("体温无效")
quot;

match = re.match(pattern, temperature)

if match:
    print("体温有效")
else:
    print("体温无效")

实战案例：格式化数字

# 格式化数字，添加逗号分隔符
import re

number = 123456789
pattern = "^(\d{1,3})(\d{3})+(?:\.(\d{1,2}))?# 格式化数字，添加逗号分隔符
import re

number = 123456789
pattern = "^(\d{1,3})(\d{3})+(?:\.(\d{1,2}))?$"
replacement = "\g<1>,\g<2>\g<3>"

formatted_number = re.sub(pattern, replacement, str(number))

print(formatted_number)  # 输出：123,456,789
quot;
replacement = "\g<1>,\g<2>\g<3>"

formatted_number = re.sub(pattern, replacement, str(number))

print(formatted_number)  # 输出：123,456,789

实战案例：格式化金额

# 格式化金额，添加人民币符号
import re

amount = 12345.67
pattern = "^￥(\d{1,3})(\d{3})+(?:\.(\d{1,2}))?# 格式化金额，添加人民币符号
import re

amount = 12345.67
pattern = "^￥(\d{1,3})(\d{3})+(?:\.(\d{1,2}))?$"
replacement = "￥\g<1>,\g<2>\g<3>"

formatted_amount = re.sub(pattern, replacement, str(amount))

print(formatted_amount)  # 输出：￥12,345.67
quot;
replacement = "￥\g<1>,\g<2>\g<3>"

formatted_amount = re.sub(pattern, replacement, str(amount))

print(formatted_amount)  # 输出：￥12,345.67

实战案例：密码强度验证

# 验证密码强度
import re

password = "Abc123!@"
pattern = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}# 验证密码强度
import re

password = "Abc123!@"
pattern = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$"

match = re.match(pattern, password)

if match:
    print("密码强度强")
else:
    print("密码强度弱")
quot;

match = re.match(pattern, password)

if match:
    print("密码强度强")
else:
    print("密码强度弱")