Email Address Validation: Non-CFFORM

[felixtkatt]

I'm attempting to create a (very) weak email validation bit using a simple CFIF and a few string functions. Here's the code:

<cfif (FindNoCase(emailFrom, &quot;.com&quot;) IS NOT 0) OR 
      (FindNoCase(emailFrom, &quot;.net&quot;) IS NOT 0) OR
      (FindNoCase(emailFrom, &quot;.org&quot;) IS NOT 0) OR
      (FindNoCase(emailFrom, &quot;.edu&quot;) IS NOT 0) OR
      (FindNoCase(emailFrom, &quot;.gov&quot;) IS NOT 0)>

...Do good email stuff...
<cfelse>
...Tell them their dumb for typing a bogus email address...
</cfif>

emailFrom contains the email address from a form field on the previous page. The real sticker is that FindNoCase is returning 0 on every call. I tried having the function search for the "at" symbol (@) instead, and it still came up 0. Are there characters that FindNoCase can't find? Is my sytax wrong somewhere? Someone please help! FTK

 

[tleish]

A regular expresison would do the best. Keep in mind, there's all sorts of email addresses now, especially condidering email address from different countries. There are a lot of emails out there that do not have the domain extensions listed above.

<CFIF REFindNoCase(&quot;^

[

^@%*<>

]

+@

[

^@%*<>

]

{2,255}\.

[

^@%*<>

]

{2,5}&quot;, trim(form.emailFrom)) IS 0>
<CFSET ErrorMessage = ErrorMessage & &quot;<LI>Sorry, you have entered an invalid E-mail address.<BR>&quot;>
</CFIF>

Translated into english, the email address may be in the following format:
address name, at least one character, may not contain the following characters, right after the start of the line (&quot;@%*<> &quot;). Then an @ symbol (&quot;@&quot;) then the domain name that may not contain the above characters, again, of a minimum length of 2, maximum 255. Then a period (&quot;\.&quot;), then a series of characters (the top level domain) that may not contain the above, again.

It is important to trim the e-mail to take off blank space.


If you wanted to just check for the common domains you listed, you could to.

<CFIF REFindNoCase(&quot;^

[

^@%*<>

]

+@

[

^@%*<>

]

{2,255}\.(com|net|org|edu|gov)&quot;, trim(form.emailFrom)) IS 0>
<CFSET ErrorMessage = ErrorMessage & &quot;<LI>Sorry, you have entered an invalid E-mail address.<BR>&quot;>
</CFIF> - tleish

 

[CFDude]

If you are running CF 5, there is a user defined function at

http://www.cflib.org

called IsEmail() that will do what you are looking for.

HTH,
Tim P.

 

[felixtkatt]

I guess I should learn regular expressions, huh?

Thanks for your help, that CFIF was exactly what I needed. FTK