转换函数已弃用（ereg，ereg_replace，eregi，eregi_replace，split）

i have looked into the past topics and read some questions relative of this argument. What i need is just a confirm, i have a lot of pages that uses functions that are deprecated now. I wanto to change those functions but i need to know if this type of changin is correct.

(Example)

//Ereg
$pattern = "[[:space:]]";
$replace = "_"; 
$string   = "Hello to Everyone"; 
echo ereg_replace($pattern, $replace, $string); 

To convert into preg_replace can i do this?

//Preg
$pattern = "[[:space:]]";
$pattern = '/'.addcslashes($pattern, '/').'/';
$replace = "_"; 
$string   = "Hello to Everyone"; 
echo preg_replace($pattern, $replace, $string); 

I Know that in this example i don't need to use the addcslashes function but sometimes i need to use a pattern with slashes and so i want to understand how to use it.

So if is correct this '/'.addcslashes($pattern, '/').'/'; or if i Have to change something.

Thanks a lot!!!

You need to change all patterns more or less manually, from what I know no function exists that does this for you.

In any case addcslashes is not fitting for the job.