Re: [PHP-WIN] preg interpretation question

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 <[email protected]> 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?
>
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