naming convention

how can i validate a field for a valid URL?? is ther any naming
conventions for it?

angie a écrit :
> how can i validate a field for a valid URL?? is ther any naming
> conventions for it?

Same as for your question about identifying the IP address.
You can check again a regex (there are many already done out there).
A good starting point is:
http://regexlib.com/DisplayPatterns...=1&categoryId=2

Michael

On Apr 2, 2:46 pm, Michael DOUBEZ <michael.dou...@free.fr> wrote:
> angie a =E9crit :
 

> Same as for your question about identifying the IP address.
> You can check again a regex (there are many already done out there).
> A good starting point is:http://regexlib.com/DisplayPatterns.aspx?cattabin=[/color
]
dex=3D1&categoryId=3D2

Except that a regular expression which accepts all syntactically
valid URL's, and rejects all syntactically invalid ones, is far
from trivial; the one you cite, for example, will reject a lot
of legal URL's ("news://comp.lang.c%2B%2B", for example:-), and
accept a few illegal ones (e.g. "www.").  I pretty sure it can
be done with a regular expression, but it will take a bit of
work to get it right.  (Note too that different types of URL's
may have slightly different syntax.  If the protocol is
"mailto", for example, a '@' is required at one point, whereas
if it is "http", one may not appear unless quoted somehow (e.g.
"%40").

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James Kanze a écrit :
> On Apr 2, 2:46 pm, Michael DOUBEZ <michael.dou...@free.fr> wrote: 
> 
> 
>
> Except that a regular expression which accepts all syntactically
> valid URL's, and rejects all syntactically invalid ones, is far
> from trivial; the one you cite, for example, will reject a lot
> of legal URL's ("news://comp.lang.c%2B%2B", for example:-), and
> accept a few illegal ones (e.g. "www.").  I pretty sure it can
> be done with a regular expression, but it will take a bit of
> work to get it right.

Yes. That is why I provided the link to a regex library instead of
giving a specific regex. The site indicate what URI are accepted or
rejected depending on the regex used.

>  (Note too that different types of URL's
> may have slightly different syntax.  If the protocol is
> "mailto", for example, a '@' is required at one point, whereas
> if it is "http", one may not appear unless quoted somehow (e.g.
> "%40").

Or ftp that uses @ to separate the username/password from the actual
address:
ftp://john_dow:password@ftp.secure.com:245/path/to/data

Perhaps Boost.Spirit would be more fitting for capturing more complex
URI. At least It would be more manageable.

Michael