I am trying to find and replace binary values in strings:
$str = '('.chr(0x00).chr(0x91).')' ; $str = preg_replace("/\x00\x09/",'-',$str) ;
But I am getting “Warning: preg_replace(): Null byte in regex” error message.
How to work on binary values in Regex/PHP?
It is because you are using double quotes
" around your regex pattern, which make the php engine parse the chars
If you use single quotes instead, it will work:
$str = '(' . chr(0x00) . chr(0x91) . ')' ; $str = preg_replace('/\x00\x09/', '-', $str) ;
But your regex seems also not to be correct, if I understood your question correctly. If you want to replace the chars
\x91 with a dash
-, you must put them into brackets
$str = preg_replace('/[\x00\x91]/', '-', $str) ;