Blocking a period at a specific location using RegEx

Blocking a period at the end of a whitelisted URL?

I have a RegEx which is partly working to help verify a white listed list of domains, with '|' as delimiter, is working

              string regEx3 = @"https?://(" + whitelist + ")(.*)\\?(goto|returnurl)=https?://(" + whitelist + ")";

But I need to BLOCK a domain which uses my white listed domain as a sub-domain.


sso.mydomain.com is okay, but the following is not
sso.mydomain.com.badURL.com


I need to make the RegEx fail when it discovers a period after the white listed domain.

How?

Thanks
newbiewebSr. Software EngineerAsked:
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Rgonzo1971Commented:
Hi,

pls try by replacing
"(" + whitelist + ")"

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with
"((" + whitelist + ")(?:[^\.]))"

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Regards

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AndyAinscowFreelance programmer / ConsultantCommented:
Have you considered alternative approaches?
eg. something like

String[] arWhitelist = whitelist.Split("|");  //get an array of the individual sites
foreach(string s in arWhitelist)
{
  if(String.Compare(s, sIsThisSiteOK, true) == 0)  //case independent comparison, 0 means the two strings match
    return true;
}
return false;
nociSoftware EngineerCommented:
Well there should be a / after domain names, or ? ... (or end of string)...
so a (/|\?|$)  at the end of the domain name should match this

so "((" + whitelist + ")(/|\?|$))"   should handle this case.
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aikimarkCommented:
From the examples you've shown us, there is not supposed to be any characters after your second whitelist. That is where the $ pattern comes in handy.  I think noci may be a bit more detailed than I would have been, so deserves points.
louisfrCommented:
There could be an anchor. (/|\?|\#|$)
newbiewebSr. Software EngineerAuthor Commented:
thanks
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