Python，替换字符串中模式的所有匹配项

import re

# 原始字符串
text = "Hello, world! Hello, everyone!"

# 要替换的模式
pattern = r"Hello"

# 替换的字符串
replacement = "Hi"

# 使用 re.sub() 替换所有匹配项
result = re.sub(pattern, replacement, text)

print(result)  # 输出: Hi, world! Hi, everyone!

result = re.sub(pattern, replacement, text, flags=re.IGNORECASE)

def replace_function(match):
    return match.group(0).upper()  # 将匹配的字符串转换为大写

result = re.sub(pattern, replace_function, text)
print(result)  # 输出: HELLO, world! HELLO, everyone!