Regular Expression

[Ben]

I am trying to validate a textbox in which the user enters the following -
"smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I have
tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx. Does
anyone have any idea how to validate this string.
VB2005

[pvdg42]

Re: Regular Expression


"Ben" <Ben@discussion s.microsoft.com > wrote in message
news:6E18AFDE-5A22-4471-97C5-EF4274BFD47F@mi crosoft.com...[color=blue]
>I am trying to validate a textbox in which the user enters the following -
> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I
> have
> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx.
> Does
> anyone have any idea how to validate this string.
> VB2005
>[/color]
You might consider a tutorial such as these...

http://www.grymoire.com/Unix/Regular.html

http://www.zvon.org/other/PerlTutorial/Output/contents.html

[Homer J Simpson]

Re: Regular Expression


"Ben" <Ben@discussion s.microsoft.com > wrote in message
news:6E18AFDE-5A22-4471-97C5-EF4274BFD47F@mi crosoft.com...[color=blue]
> I am trying to validate a textbox in which the user enters the following -
> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I
> have
> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx.
> Does
> anyone have any idea how to validate this string.
> VB2005[/color]

What if it is smtp.servername .bc.ca or similar? You don't get those?

[Chris Chilvers]

Re: Regular Expression

On Sun, 30 Apr 2006 18:41:53 GMT, "Homer J Simpson" <nobody@nowhere .com>
wrote:
[color=blue]
>
>"Ben" <Ben@discussion s.microsoft.com > wrote in message
>news:6E18AFD E-5A22-4471-97C5-EF4274BFD47F@mi crosoft.com...[color=green]
>> I am trying to validate a textbox in which the user enters the following -
>> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I
>> have
>> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx.
>> Does
>> anyone have any idea how to validate this string.
>> VB2005[/color]
>
>What if it is smtp.servername .bc.ca or similar? You don't get those?
>
>[/color]

Or something like localhost or mymailcomuter.m yinternaldomain

[Göran Andersson]

Re: Regular Expression

Ben wrote:[color=blue]
> I am trying to validate a textbox in which the user enters the following -
> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I have
> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx. Does
> anyone have any idea how to validate this string.
> VB2005
>[/color]

Use something like:

"(\w+\.){2,3}\w +"

[david]

Re: Regular Expression

On 2006-04-30, Göran Andersson <guffa@guffa.co m> wrote:[color=blue]
> Ben wrote:[color=green]
>> I am trying to validate a textbox in which the user enters the following -
>> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I have
>> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx. Does
>> anyone have any idea how to validate this string.
>> VB2005
>>[/color]
>
> Use something like:
>
> "(\w+\.){2,3}\w +"[/color]

Don't forget hyphen...

([-\w]+\.)+[-\w]+


OK, I spose that should really be...
(\w+([-\w]+)*\w\.)+(\w+([-\w]+)*\w)

That middle '+' should be a star if we want to match on the local
domain, though.

Beyond just ensuring it's a valid DNS hostname, I'm not sure if the OP
really has additional constraints or if the question is just poorly
worded, so I'm assuming we're just looking for well-formed names.

[Ben]

Re: Regular Expression

Thanks to all of you. and Thanks for the website with the tutorials.
Thanks

"david" wrote:
[color=blue]
> On 2006-04-30, Göran Andersson <guffa@guffa.co m> wrote:[color=green]
> > Ben wrote:[color=darkred]
> >> I am trying to validate a textbox in which the user enters the following -
> >> "smtp.servernam e.com or .net or .org or .com.uk etc... and I cannot. I have
> >> tried. The string is in the form xxxxx.xxxxxxx.x xx or xxxx.xxxxx.xxx. xx. Does
> >> anyone have any idea how to validate this string.
> >> VB2005
> >>[/color]
> >
> > Use something like:
> >
> > "(\w+\.){2,3}\w +"[/color]
>
> Don't forget hyphen...
>
> ([-\w]+\.)+[-\w]+
>
>
> OK, I spose that should really be...
> (\w+([-\w]+)*\w\.)+(\w+([-\w]+)*\w)
>
> That middle '+' should be a star if we want to match on the local
> domain, though.
>
> Beyond just ensuring it's a valid DNS hostname, I'm not sure if the OP
> really has additional constraints or if the question is just poorly
> worded, so I'm assuming we're just looking for well-formed names.
>
>[/color]