如何从字符串中删除一些特殊字符？

import re

def remove_special_characters(string):
    pattern = r'[^a-zA-Z0-9]'  # 匹配非字母和数字字符
    return re.sub(pattern, '', string)

# 示例用法
string = 'Hello, World! 123#@'
result = remove_special_characters(string)
print(result)  # 输出: HelloWorld123

def remove_special_characters(string):
    special_characters = [' ', ',']
    for char in special_characters:
        string = string.replace(char, '')
    return string

# 示例用法
string = 'Hello, World!'
result = remove_special_characters(string)
print(result)  # 输出: HelloWorld!