note 93004 deleted from function.stripos by danbrown

Note Submitter: vgiralt ---- The mail validator example is NON CONFORMANT with SMTP mail RFCs. Valid characters for Internet e-mail address are more than the ones listed here. Implementing such lame validator is a big disservice to the whole Internet. Those interested can read RFC 5322. In short, the valid characters are different on both sides of the @ sign, so, before applying this fast technique the address should be exploded into the two side strings, and then, use different valid character strings for the local-part and the domain. A local part can be any alphabetic or digit US-ASCII character plus "!#$%&'*+-/=?^_`{|}~", and then, if it is enclosed in double-quotes ("), it can be any US-ASCII character except double-quote (") and back-slash(\). The domain can be any printable US-ASCII characters not including "[", "]", or "\". And then, this could be overridden with the advent of internationalized domains, that can use UTF-8 character sets. Implementation of the validator is left as an exercise for the reader.