python
#coding:utf-8




username = "1234567890!@#!@#!@#$%======$%|&***"

username = sql_filter(username)  # SQL注入
print(username)

# 输出结果是:1234567890

s="fdgdfd,..,/[]"
import re

def remove_special(s):
    new=""
    for i in s:
        if  re.search(u'^[\\\_.a-zA-Z0-9\u4e00-\u9fa5]+$', i):
            new+=i
    return new

print(remove_special(s))