REFindNocase breakdown

"^[_a-z0-9-]+   (\.[_a-z0-9-]+)*  @  [a-z0-9-]+  (\.[a-z0-9-]+)*  \.(([a-z]{2,3})|(aero|coop|info|museum|name))$"
        1                         2             3         4                  5                      7                                8
                                                                                               |__________________6__________________|
                                                                                                  |____________________9_________________|

here's a break down of the section I explained numbered on the regex... maybe it'll help to see it sectioned out a little easier....

section 7 and 8 are groups within a group (    ([a-z]{2,3})    |     (aero|coop|info|museum|name)     )
$ means matching that overall group at the end of the line

within that group you have two groups and the overall group is checking for an instance of one or the other

(  ([a-z]{2,3}) |  (aero|coop|info|museum|name)  )  =  (  (lowercase letter 2 or 3 times)   OR    ("aero" or "coop" or "info" or "museum" or "name)   )
                                                                                           example: "ca" or "com"

the period before means checking for ".ca or .com" OR ".aero or .coop or .info or .museum or .name"

let me know if you're still unclear ;o)

wow, that clears things up! thanks for taking the time.
Shawn

PS I hate using things when I don't understand them :)

with the REFindNoCase()...

 <cfif not REFindNocase("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.(([a-z]{2,3})|(aero|coop|info|museum|name))$", FORM.ClientEmailNewPassword)>

basically this is saying <cfif> you don't find (case insensitive) an email which matches the standard format or little different format....

examples:
something@somewhere.com (standard format)
something@somewhere.ca (standard format)
""
or

something@somewhere.aero
something@somewhere.coop
something@somewhere.info
something@somewhere.museum
something@somewhere.name
""

or

something@somewhere.ca.aero
something@somewhere.tw.com
something@somewhere.com.tw
""

then do what's inside that <cfif> block

Lol, yeah the regex's (especially when they're long) can seem overwhelming or complex, it really helps to copy it and section it out to understand what it's doing each step of the way...

Glad I was able to help clear it up some, good luck!
I know what you mean by inderstanding it too, I started learning regex's that way, had to understand what each thing meant, but before long it gets easier ;o)

Thanks,
~trail

thanks again ~trail...much appreciated :-D