如何在PYTHON中打开文件并使用regex修改其内容以查找/匹配/替换模式

import re

def replace_patterns_in_file(file_path, pattern, replacement):
    # 打开文件并读取内容
    with open(file_path, 'r') as file:
        content = file.read()

    # 使用正则表达式查找、匹配和替换模式
    modified_content = re.sub(pattern, replacement, content)

    # 将修改后的内容写回文件
    with open(file_path, 'w') as file:
        file.write(modified_content)

# 要修改的文件路径
file_path = 'path/to/file.txt'

# 要查找/匹配的模式
pattern = r'pattern_to_find'

# 要替换的模式
replacement = r'replacement_pattern'

# 调用函数进行替换
replace_patterns_in_file(file_path, pattern, replacement)