Finding a Regex binary pattern in PHP

Question

I am trying to find and replace binary values ​​in strings:

$str = '('.chr(0x00).chr(0x91).')' ;
$str = preg_replace("/\x00\x09/",'-',$str) ;

But I get a "Warning: preg_replace (): Zero byte in the regex message .

How to work with binary values ​​in Regex / PHP?

Answer 1

This is because you use double quotes "around your regular expression pattern, which cause the php engine to parse \x00and characters \x09.

If you use single quotes, this will work:

$str = '(' . chr(0x00) . chr(0x91) . ')' ;
$str = preg_replace('/\x00\x09/', '-', $str) ;

, . \x00 \x91 -, []:

$str = preg_replace('/[\x00\x91/]', '-', $str) ;