preg_match - how to match \x00 (null)?

[Yandos]

Hi all,

I'd like to work with a binary file....

I read the whole file into variable (it conatains binary data from 00-FF):

$fp=fopen($cfg, "r");
$content=fread( $fp,filesize($c fg));
fclose($fp);

// and then I'd like to check if it contains special binary sequence, let's say bytes "00 01
02 03":

$replacestring= "/\x00\x01\x02\x0 3/im";

if (preg_match($re placestring,$co ntent)==0) {
echo("bad input file format");
exit();
}

but i get error message:

<b>Warning</b>: preg_match(): No ending delimiter '/' found in <b>test.bat</b> on
line <b>57</b><br />

I think it is maybe because php uses strings terminated with null, but can i force php to
use strings with predefined length for example? Is there a way to work with strings
containing null characters?

Thank you in advance.

Y.

[Chung Leong]

Re: preg_match - how to match \x00 (null)?

Yandos wrote:[color=blue]
> Hi all,
>
> I'd like to work with a binary file....
>
> I read the whole file into variable (it conatains binary data from 00-FF):
>
> $fp=fopen($cfg, "r");
> $content=fread( $fp,filesize($c fg));
> fclose($fp);
>
> // and then I'd like to check if it contains special binary sequence, let's say bytes "00 01
> 02 03":
>
> $replacestring= "/\x00\x01\x02\x0 3/im";
>
> if (preg_match($re placestring,$co ntent)==0) {
> echo("bad input file format");
> exit();
> }
>
> but i get error message:
>
> <b>Warning</b>: preg_match(): No ending delimiter '/' found in <b>test.bat</b> on
> line <b>57</b><br />
>
> I think it is maybe because php uses strings terminated with null, but can i force php to
> use strings with predefined length for example? Is there a way to work with strings
> containing null characters?
>
> Thank you in advance.
>
> Y.[/color]

The PCRE library does expect the pattern to be a null-terminate string.
It is capable of looking for \0 though. Instead of the double-quoted
string, use single-quotes instead:

$replacestring= '/\x00\x01\x02\x0 3/im';

Now PCRE will see the escape sequences and correctly compile the regexp.

[Mladen Gogala]

Re: preg_match - how to match \x00 (null)?

On Tue, 06 Jun 2006 14:23:24 -0700, Chung Leong wrote:
[color=blue]
> $replacestring= '/\x00\x01\x02\x0 3/im';[/color]

Why do you use multi-line matching and what will ignoring case buy you
here?

--

http://www.mgogala.com

[Yandos]

Re: preg_match - how to match \x00 (null)?

"Chung Leong" <chernyshevsky@ hotmail.com> wrote in
news:1149629004 .581297.79180@h 76g2000cwa.goog legroups.com:
[color=blue]
>
> The PCRE library does expect the pattern to be a null-terminate
> string. It is capable of looking for \0 though. Instead of the
> double-quoted string, use single-quotes instead:
>
> $replacestring= '/\x00\x01\x02\x0 3/im';
>
> Now PCRE will see the escape sequences and correctly compile the
> regexp.
>[/color]

Works great, thank you!

Y.

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[Yandos]

Re: preg_match - how to match \x00 (null)?

Mladen Gogala <gogala@sbcglob al.net> wrote in news:pan.2006.0 6.07.07.58.37.7 53254
@sbcglobal.net:
[color=blue]
> On Tue, 06 Jun 2006 14:23:24 -0700, Chung Leong wrote:
>[color=green]
>> $replacestring= '/\x00\x01\x02\x0 3/im';[/color]
>
> Why do you use multi-line matching and what will ignoring case buy you
> here?
>[/color]

Thanks for comment, that's perhaps not necessary, but I'm used to do regexps that way. I'm not a
regexp guru and once something did not worked when I have not used ignore case and multiline
switches, so now I'm using em everywhere - no harm in writing 2 more letters ;) )

Y.

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