C#

([!-~][^@=\]\"])+@(\d)+(\.(\d)+)*

Kornfeld Eliyahu Peter wrote:

char except control chars (0-31), white-space (32),

Kornfeld Eliyahu Peter wrote:

@, =, " and ].

Kornfeld Eliyahu Peter wrote:

After that must come a @ (one and only one!).

Kornfeld Eliyahu Peter wrote:

The last part is made of digits optionally separated by . (dot)...

Marco Bertschi wrote:

true, but your regex only allows ! and ~

Marco Bertschi wrote:

They must be escaped, e.g. @ as \@.

Kornfeld Eliyahu Peter wrote:

According to RFC they are can't take part - no mentioning of escapes!

Quote:

Inside PARAM-VALUE, the characters '"' (ABNF %d34), '\' (ABNF %d92),
and ']' (ABNF %d93) MUST be escaped. This is necessary to avoid
parsing errors. Escaping ']' would not strictly be necessary but is
REQUIRED by this specification to avoid syslog application
implementation errors. Each of these three characters MUST be
escaped as '\"', '\\', and '\]' respectively. The backslash is used
for control character escaping for consistency with its use for
escaping in other parts of the syslog message as well as in
traditional syslog.

A backslash ('\') followed by none of the three described characters
is considered an invalid escape sequence. In this case, the
backslash MUST be treated as a regular backslash and the following
character as a regular character. Thus, the invalid sequence MUST
not be altered.

([!-~][^@=\]\"])+@(\d)+(\.(\d)+)*

([^"\]\\]|(\\")|(\\])|\\{2})*

Kornfeld Eliyahu Peter wrote:

It's not clearly stated (or I missed) but seems to me that SD-ID and PARAM-NAME should not exceed the length of 32 characters...

Marco Bertschi wrote:

This is true for SD-ID, but PARAM-NAME can be an UTF8 string of any length

RFC 5424:

SD-ID = SD-NAME
PARAM-NAME = SD-NAME

SD-NAME = 1*32PRINTUSASCII ; except '=', SP, ']', %d34 (")

Marco Bertschi wrote:

I will not check this using the Regex since I will be faster just checking for string.Length.

Marco Bertschi wrote:

I will publish my RFC5424 implementation as article on CodeProject

Kornfeld Eliyahu Peter wrote:

According to this SD-ID and PARAM-NAME are the same - SD-NAME, and SD-NAME has a maximum of 32...

Quote:

PARAM-VALUE = UTF-8-STRING ; characters '"', '\' and
; ']' MUST be escaped.

Kornfeld Eliyahu Peter wrote:

It must have to be an excellent quality - otherwise I will not let it pass moderation!

Kornfeld Eliyahu Peter wrote:

SD-PARAM is build from PARAM-NAME and PARAM-VALUE. PARAM-NAME is the same as SD-ID...

PARAM-VALUE build like

* any UTF-8

* the characters ", \ and ] must be escaped (by \)

The regex for that is -

([^"\]\\]|(\\")|(\\])|\\{2})*

(?<!\\)@|(?<!\\)\[|(?<!\\)\]|(?<!\\)"

(?<!match)

Marco Bertschi wrote:

my clever book