On 8/27/06, Peter Lauri <lists@xxxxxxxxxxx> wrote:
I found this on google, does this LONG function do anything more then your preg_match?
i think a combo of what the function does and a few regex's will work. The issue is more on how idoes it pass all the rfc's on each part of the address, for a quick reference of rfc's: http://en.wikipedia.org/wiki/E-mail_address An address consists of: local@xxxxxxxxxxxxx so the question is does it pass local tests, which should be rather simple, the domain part gets rather complcated since you cant predict at what domain level we are talking about: local@xxxxxxxxxxxxxxxxxx local@xxxxx local@xxxxxxx local@xxxxxxxxxx There is a pcre expression out there somewhere in perl land that is considered to validate all the rfc requirements of the address and is about 50 lines worth of regular expressions with a lot of backward matching and forward matching conditions. So the only simple logic you can really apply is split on the @; is local ok? are each part of the domains valid according to the rfc's. typically it is safe to say if they put at least two periods in a name and the characters between those periods are valid chars then it is a valid input ( of course it doesn't mean it is a valid email) I suppose the least you want to do is limit addresses people can use so: local <~~ assumed invalid (no @), unless you only want local addresses local@domain <~~ assumed invalid since there is no tld (unless you want a local address) everything else is valid (as long as it passes all the tests) So with that you want an expression that allows for: (valid_local){1}@(valid_domain.)+(valid_tld){1} where: valid_local = a valid local addres valid_domain = a valid domain name valid_tld = a valid tld . = period (dot) {1} = must match once + = must have 1, can have more Making a pcre expression can get complicated, breaking it apart and validating each section will probably make it easier to deal with. Curt. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
