Preg_replace regex issue

Question

I am trying to clear a string.

I need to allow only

• Upper / lower letters
• the numbers
• spaces, tabs, carriage returns
• these characters: _-+*()[]!#?.,;:'"<>

Everything else must go bye. How should I do it? I have this one that works for letters, numbers and upper / lower case spaces. But I do not know how to account for tabs, carriage returns, or how to perform special characters?

$str = preg_replace('/[^a-z0-9 ]/i', '', $str);

Answer 1

Try

$str = preg_replace('/[^\w\r\n\t+*()[\]!#?.\,;:\'"<> -]/', '', $str);

Answer 2

\ s - space character (includes tabs and line breaks)
\ r - carriage return
Use the "\" character for special symobls.

Answer 3

$str = 'sample|';
$result = !(bool)strlen(preg_replace('/^[a-z0-9A-Z\r\s:_-+*()[]!#?.,;:\>\<]*/', '', $str))