n多注入项目代码如何利用正则表达式筛选安全选项？

今天看一个项目代码，文件不多，不过每个文件中都N多注入，一个一个看实在太累，索性花了点时间，弄了个正则表达式，搜索出来，然后再将安全的筛选出去。省了不少时间的说。 

 1.查找select、update、delete语句

((select|SELECT|update|UPDATE|delete|DELETE) .*(from|FROM|set|SET) .*(where|WHERE) .*) 查询语句,对于没有条件判断的基本不存在注入问题，因而仅搜索此语句即可

例子：

select * from user where 

 2.简单的数字型注入

((select|SELECT|update|UPDATE|delete|DELETE) .*(from|FROM|set|SET) .*(where|WHERE) .*=[ ]?["]?["]?\$) 能找到select、update delete三种语句，5种格式的整形注入，如：

直接变量传入

select * from guess where id=$subject_id

update guess set is_valid=0 where id=$subject_id

delete from guess where id=$subject_id

=与变量之间存在空格

select * from guess where id= $subject_id

update guess set is_valid=0 where id= $subject_id

delete from guess where id= $subject_id

变量双引号

select * from guess where id="$subject_id"

update guess set is_valid=0 where id="$subject_id"

delete from guess where id="$subject_id"

=与双引号之间存在空格

select * from guess where id= "$subject_id"

update guess set is_valid=0 where id= "$subject_id"

delete from guess where id= "$subject_id"

=与引号、双引号之间存在空格

select * from guess where id= " $subject_id"

update guess set is_valid=0 where id= " $subject_id"

delete from guess where id= " $subject_id"