Regular Expression

  • Thread starter Thread starter Guest
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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
 
Ben said:
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
Click to expand...

What if it is smtp.servername.bc.ca or similar? You don't get those?
 
Ben said:
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
Click to expand...

Use something like:

"(\w+\.){2,3}\w+"
 
Use something like:

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

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

david said:
Use something like:

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

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.
Click to expand...
 
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