"\" to removes the special meaning of "x".

Snippet from
http://www.cisco.com/en/US/docs/security/ips/6.2/command/reference/crIntro.html

Regular Expression Syntax

Regular expressions are text patterns that are used for string matching.
Regular expressions contain a mix of plain text and special characters to
indicate what kind of matching to do. For example, if you are looking for a
numeric digit, the regular expression to search for is "[0-9]". The brackets
indicate that the character being compared should match any one of the
characters enclosed within the bracket. The dash (-) between 0 and 9
indicates that it is a range from 0 to 9. Therefore, this regular expression
will match any character from 0 to 9, that is, any digit.

To search for a specific special character, you must use a backslash before
the special character. For example, the single character regular expression
"\*" matches a single asterisk.

The regular expressions defined in this section are similar to a subset of
the POSIX Extended Regular Expression definitions. In particular, "[..]",
"[==]", and "[::]" expressions are not supported. Also, escaped expressions
representing single characters are supported. A character can be represented
as its hexadecimal value, for example, \x61 equals `a,' so \x61 is an
escaped expression representing the character `a.'



With regards
Kings

On Thu, May 5, 2011 at 8:43 AM, Jim Terry <[email protected]> wrote:

> Hi all,
>
> I am trying to figure out regex and I want to test my input on the PIX.  so
> I did this and I expected it to match- but it did not:
>
> pixfirewall(config)# test regex 0x06 \x06
> INFO: Regular expression match failed.
>
> Can someone tell me why 0x06 and \x06 are not the same?
>
> Thanks,
>
> JT
>
>
>
>
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