txt怎么批量替换_txt如何批量替换

import os

def replace_in_file(filepath, old_string, new_string):
    """替换单个文件中的字符串"""
    try:
        with open(filepath, 'r', encoding='utf-8') as f: # 尝试UTF-8编码
            content = f.read()
        new_content = content.replace(old_string, new_string)
        with open(filepath, 'w', encoding='utf-8') as f:
            f.write(new_content)
        print(f"文件 {filepath} 替换成功")
    except UnicodeDecodeError:
        try:
            with open(filepath, 'r', encoding='gbk') as f: # 尝试GBK编码
                content = f.read()
            new_content = content.replace(old_string, new_string)
            with open(filepath, 'w', encoding='gbk') as f:
                f.write(new_content)
            print(f"文件 {filepath} 替换成功 (GBK)")
        except Exception as e:
            print(f"文件 {filepath} 替换失败: {e}")


def batch_replace(directory, old_string, new_string):
    """批量替换目录下所有txt文件中的字符串"""
    for filename in os.listdir(directory):
        if filename.endswith(".txt"):
            filepath = os.path.join(directory, filename)
            replace_in_file(filepath, old_string, new_string)

# 使用示例
if __name__ == "__main__":
    directory = "your_directory"  # 替换成你的目录
    old_string = "old_text" # 要替换的字符串
    new_string = "new_text" # 替换后的字符串
    batch_replace(directory, old_string, new_string)

import chardet

def detect_encoding(filepath):
    """检测文件编码"""
    with open(filepath, 'rb') as f:
        result = chardet.detect(f.read())
    return result['encoding']

def replace_in_file_with_encoding(filepath, old_string, new_string):
    """替换单个文件中的字符串，并指定编码"""
    encoding = detect_encoding(filepath)
    try:
        with open(filepath, 'r', encoding=encoding) as f:
            content = f.read()
        new_content = content.replace(old_string, new_string)
        with open(filepath, 'w', encoding=encoding) as f:
            f.write(new_content)
        print(f"文件 {filepath} 替换成功 (编码: {encoding})")
    except Exception as e:
        print(f"文件 {filepath} 替换失败: {e}")

def replace_in_file_line_by_line(filepath, old_string, new_string):
    """逐行替换文件中的字符串"""
    try:
        with open(filepath, 'r', encoding='utf-8') as f:
            lines = f.readlines()
        with open(filepath, 'w', encoding='utf-8') as f:
            for line in lines:
                new_line = line.replace(old_string, new_string)
                f.write(new_line)
        print(f"文件 {filepath} 逐行替换成功")
    except Exception as e:
        print(f"文件 {filepath} 逐行替换失败: {e}")

find . -name "*.txt" -exec sed -i 's/old_text/new_text/g' {} \;

import re

def replace_dollar(filepath):
    """替换文件中的$符号"""
    try:
        with open(filepath, 'r', encoding='utf-8') as f:
            content = f.read()
        new_content = content.replace('$', '$$') # 直接替换
        with open(filepath, 'w', encoding='utf-8') as f:
            f.write(new_content)
        print(f"文件 {filepath} $符号替换成功")
    except Exception as e:
        print(f"文件 {filepath} $符号替换失败: {e}")

import re

def replace_with_regex(filepath, pattern, replacement):
    """使用正则表达式替换文件内容"""
    try:
        with open(filepath, 'r', encoding='utf-8') as f:
            content = f.read()
        new_content = re.sub(pattern, replacement, content, flags=re.MULTILINE)
        with open(filepath, 'w', encoding='utf-8') as f:
            f.write(new_content)
        print(f"文件 {filepath} 正则替换成功")
    except Exception as e:
        print(f"文件 {filepath} 正则替换失败: {e}")

# 使用示例
if __name__ == "__main__":
    filepath = "your_file.txt"
    pattern = r"^abc.*$"  # 匹配以abc开头的行
    replacement = "xyz"
    replace_with_regex(filepath, pattern, replacement)