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From: Mark Murphy on 10 Jan 2010 20:37
Can someone interpret this preg string for me?

/[^a-z0-9\\/\\\\_.:-]/i

Here is what I can decipher. the match is case insensitive, and it
excludes all letters, and numbers, and the characters _ . : and - (that
is underscore, period, colon, and dash). The part I don't understand is
\\/\\\\. Sees to me to say backslash, slash, backslash, backslash. Why
the need for so many backslashes?
From: Ferenc Kovacs on 11 Jan 2010 04:52
if its a parameter for some shell code, then you need to douple escape
the escapest.
If I remember correctly, if you need an escape char in a string, you
can put it in with \\, but if you need to put an escape char to a
string which will be executed via exec/system/etc. then you have to
put an escaped escape char, so in the end you need four escape char.

correct me, if Im wrong.

Tyrael

On Mon, Jan 11, 2010 at 2:37 AM, Mark Murphy <mmurph(a)cinci.rr.com> wrote:
> Can someone interpret this preg string for me?
>
> /[^a-z0-9\\/\\\\_.:-]/i
>
> Here is what I can decipher.  the match is case insensitive, and it excludes
> all letters, and numbers, and the characters _ . : and - (that is
> underscore, period, colon, and dash).  The part I don't understand is
> \\/\\\\.  Sees to me to say backslash, slash, backslash, backslash.  Why the
> need for so many backslashes?
>
> --
> PHP Windows Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
From: Pierre Joye on 11 Jan 2010 05:07
On Mon, Jan 11, 2010 at 2:37 AM, Mark Murphy <mmurph(a)cinci.rr.com> wrote:
> Can someone interpret this preg string for me?
>
> /[^a-z0-9\\/\\\\_.:-]/i
>
> Here is what I can decipher.  the match is case insensitive, and it excludes
> all letters, and numbers, and the characters _ . : and - (that is
> underscore, period, colon, and dash).  The part I don't understand is
> \\/\\\\.  Sees to me to say backslash, slash, backslash, backslash.  Why the
> need for so many backslashes?

Reserved character has to be escaped using \, and \ is a reserved character..

Btw, ereg is deprecated, I would suggest to use PCRE instead,
http://www.php.net/pcre

Cheers,
--
Pierre

http://twitter.com/pierrejoye | http://blog.thepimp.net | http://www.libgd.org
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