Regular Expression

[Guest]

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

 

[pvdg42]

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

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]

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

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

 

[Chris Chilvers]

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

Or something like localhost or mymailcomuter.myinternaldomain

 

[Guest]

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

Use something like:

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

 

[david]

Use something like:

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

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.

 

[Guest]

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

Use something like:

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

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.